{"id":25301,"date":"2025-09-12T13:53:22","date_gmt":"2025-09-12T11:53:22","guid":{"rendered":"https:\/\/aquaforest.eu\/knowledge-base\/no3-i-po4-w-akwarium-wszystko-co-musisz-wiedziec-o-azotanach-i-fosforanach-w-twoim-zbiorniku\/"},"modified":"2025-09-12T14:23:12","modified_gmt":"2025-09-12T12:23:12","password":"","slug":"no3-i-po4-w-akwarium-wszystko-co-musisz-wiedziec-o-azotanach-i-fosforanach-w-twoim-zbiorniku","status":"publish","type":"docs","link":"https:\/\/aquaforest.eu\/en\/knowledge-base\/no3-i-po4-w-akwarium-wszystko-co-musisz-wiedziec-o-azotanach-i-fosforanach-w-twoim-zbiorniku\/","title":{"rendered":"NO3 and PO4 in your aquarium: everything you need to know about nitrates and phosphates"},"content":{"rendered":"\n<p>Today we&#8217;re taking on two key elements that are causing quite a bit of excitement in the aquarium world: nitrates (<sub>NO3<\/sub>) and phosphates (<sub>PO4<\/sub>). If you&#8217;ve ever wondered why your aquarium looks like an algae plantation or why plants grow slower than you&#8217;d like, this article is for you. We&#8217;ll explain what <sub>NO3<\/sub> and <sub>PO4<\/sub> are, where they come from, how they affect your aquarium and, most importantly, how to control them. Whether you&#8217;re just a beginner to aquariums or have years of experience behind you, you&#8217;ll find something here for you. Here we go!    <\/p>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-04f9a9bb9e8b54f89e7d4ed7ebbcfe2b\" style=\"color:#f1005d\"><strong>What are NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO4?<\/strong><\/h2>\n\n<p>Let&#8217;s start with the basics. Nitrates (<sub>NO3<\/sub>) and phosphates (<sub>PO4<\/sub>) are chemical compounds that play a key role in the aquarium ecosystem. They are macronutrients, i.e. substances that plants need in larger quantities to grow healthily. But beware &#8211; balance is the key word here. Too much or too little of these elements can cause chaos in the tank.    <\/p>\n\n<p><strong>Nitrates (NO<\/strong><strong><sub>3<\/sub><\/strong><strong>)<\/strong> is the end product of the nitrogen cycle in an aquarium. It all starts with fish feces, food scraps or dead plants, which decompose to form ammonia (NH<sub>3<\/sub>). This one is toxic, but fortunately nitrifying bacteria (like <em>Nitrosomonas<\/em> and <em>Nitrobacter<\/em>) convert it first into nitrites (NO<sub>2<\/sub>) and then into nitrates. NO<sub>3<\/sub> is already much less harmful, but in excess it can cause problems, as we&#8217;ll discuss in a moment.   <\/p>\n\n<p><strong>Phosphates (PO<\/strong><strong><sub>4<\/sub><\/strong><strong>)<\/strong>, on the other hand, are phosphorus compounds that enter the aquarium from a variety of sources: from fish food to decaying organic matter to tap water. Phosphorus is essential for plants because it is part of their DNA, enzymes and supports processes such as photosynthesis. The problem arises when there is too much phosphate &#8211; that&#8217;s when the algae start the party, and you have green soup in the tank.  <\/p>\n\n<figure class=\"wp-block-image aligncenter size-medium\"><a href=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_NO3-217x300.png\"><img fetchpriority=\"high\" decoding=\"async\" width=\"217\" height=\"300\" src=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_NO3-217x300.png\" alt=\"NO3 test for marine aquarium\" class=\"wp-image-11569\" srcset=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_NO3-217x300.png 217w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_NO3.png 434w\" sizes=\"(max-width: 217px) 100vw, 217px\" \/><\/a><\/figure>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-dd7a08c2069e93f7f19ce3874599a9e7\" style=\"color:#f1005d\"><strong>Where do nitrates and phosphates come from?<\/strong><\/h2>\n\n<p>Understanding where <sub>NO3<\/sub> and <sub>PO4<\/sub> come from is the key to controlling them. Here are the main sources of these compounds: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Fish feces and food residues<\/strong>: Fish produce ammonia, which is converted to nitrates in the nitrification process. Food scraps that have not been eaten decompose, releasing both <sub>NO3<\/sub> and <sub>PO4<\/sub>. <\/li>\n\n\n\n<li><strong>Tap water<\/strong>: In some regions, tap water already contains nitrates and phosphates. It is worth checking this with tests before you pour it into the aquarium. <\/li>\n\n\n\n<li><strong>Aquarium Fertilizers<\/strong>: If you use fertilizers for plants, you may unknowingly raise <sub>NO3<\/sub> and <sub>PO4<\/sub> levels. For example, the popular <sub>KNO3<\/sub> fertilizer provides nitrates. <\/li>\n\n\n\n<li><strong>Decomposition of plants and algae<\/strong>: Dead plant leaves or algae that decompose in the tank release phosphates and nitrogen compounds.<\/li>\n\n\n\n<li><strong>Substrate:<\/strong> Some substrates, like ADA Amazonia, can release a lot of nutrients at first, which raises <sub>NO3<\/sub> and <sub>PO4<\/sub> levels.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-2e52dac3cee8b17744f8e359d34b6e62\" style=\"color:#f1005d\"><strong>Why NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO4 are important?<\/strong><\/h2>\n\n<p>Nitrates and phosphates are like fuel for your aquarium plants. Without them, your plants will become stunted, leaves will yellow, and growth will stall. But their impact goes beyond plants:  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Plants<\/strong>: <sub>NO3<\/sub> is a building block for chlorophyll and proteins, and <sub>PO4<\/sub> supports energy processes. Optimal concentrations (<sub>NO3<\/sub>: 10-20 mg\/l or 10-20 ppm for plant aquariums, 5-10 ppm in low-tech, while <sub>PO4<\/sub>: 0.5-2 mg\/l or 0.5-2 ppm [usually 1-1.5 ppm in plant aquariums, 0.2-1 ppm in general aquariums]) make plants grow lush and healthy. <\/li>\n\n\n\n<li><strong>Algae<\/strong>: Excess <sub>NO3<\/sub> and <sub>PO4<\/sub> are an invitation to algae. In particular, the ratio between these elements (the so-called Redfield ratio, which we&#8217;ll talk about shortly) matters. If the balance is disturbed, algae can take over.  <\/li>\n\n\n\n<li><strong>Fish<\/strong>: Nitrates in concentrations above 50 mg\/L can be harmful to sensitive fish species, causing stress or disease. Phosphates by themselves are not toxic to fish, but excess phosphates promote algae, which reduce oxygen levels in the water. <\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-0b947cc26023c8cd6fae72b89e1e7695\" style=\"color:#f1005d\"><strong>The Redfield ratio: the key to nutrient balance<\/strong><\/h2>\n\n<p>The topic of <sub>NO3<\/sub> to <sub>PO4<\/sub> ratio, called the Redfield ratio, often comes up on aquarium forums. In short, it&#8217;s about the ratio of nitrogen to phosphorus to maintain a healthy ecosystem. In marine tanks, a ratio of 16:1 (nitrogen:phosphorus) is ideal, but in freshwater plant aquariums, a ratio of 10-15:1 is more common.  <\/p>\n\n<p>Example? If you have <sub>NO3<\/sub> at 15 mg\/l, then <sub>PO4<\/sub> should be around 1-1.5 mg\/l. Too much phosphate with low nitrate (or vice versa) can lead to algae infestation, especially cyanobacteria. Therefore, it is a good idea to test the water regularly and adjust fertilization.   <\/p>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-2ac22e7281d9a85b908ea047484622cd\" style=\"color:#f1005d\"><strong>How to measure NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO<\/strong><strong><sub>4<\/sub><\/strong><strong>?<\/strong><\/h2>\n\n<p>Don&#8217;t guess &#8211; test! Aquarium tests for <sub>NO3 <\/sub>and <sub>PO4<\/sub> are a must. We recommend kits from reputable brands. They are easy to use and give reliable results. How does it work?    <\/p>\n\n<ol class=\"wp-block-list\">\n<li>Take a water sample from the aquarium.<br\/><\/li>\n\n\n\n<li>Add reagents according to the instructions.<br\/><\/li>\n\n\n\n<li>Compare the color of the water with the color scale.<br\/><\/li>\n<\/ol>\n\n<p>Strip tests are less accurate, so for precision, opt for drop tests or photometers, especially in reef tanks where low nutrient levels need to be detectable. Weekly testing helps you catch changes before they become problems, ensuring nutrient levels will stabilize. <\/p>\n\n<figure class=\"wp-block-image aligncenter size-medium\"><a href=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_PO4-217x300.png\"><img decoding=\"async\" width=\"217\" height=\"300\" src=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_PO4-217x300.png\" alt=\"Water tests that measure PO4 levels - TestPro PO4\" class=\"wp-image-11568\" srcset=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_PO4-217x300.png 217w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2024\/06\/TestPro_PO4.png 434w\" sizes=\"(max-width: 217px) 100vw, 217px\" \/><\/a><\/figure>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-c1da7f0d6aa1c0be74089a135ef855f5\" style=\"color:#f1005d\"><strong>Problems with NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO<\/strong><strong><sub>4<\/sub><\/strong><strong> &#8211; symptoms and solutions<\/strong><\/h2>\n\n<h3 class=\"wp-block-heading\"><strong>High nitrates (NO<\/strong><strong><sub>3)<\/sub><\/strong><\/h3>\n\n<p><strong>Symptoms<\/strong>: Green water, filamentous algae, stress in fish, slower plant growth.<br\/><strong>Causes<\/strong>: Overfeeding of fish, overstocking, lack of regular water changes, fertilizers with nitrates.<br\/><strong>Solutions<\/strong>:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Water changes<\/strong>: Regular water changes (10% per week) are the easiest way to lower <sub>NO3<\/sub>. Use low nitrate water (such as RO). <\/li>\n\n\n\n<li><strong>Biological filt<\/strong>ration: enhance filtration with nitrifying bacteria.<\/li>\n\n\n\n<li><strong>Fast-growing plants<\/strong>: Plants such as soaker or hornwort absorb nitrates like a vacuum cleaner.<\/li>\n\n\n\n<li><strong>Filter cartridges<\/strong> that will effectively remove nitrates.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\"><strong>High phosphate levels<\/strong><\/h3>\n\n<p><strong>Symptoms<\/strong>: Algae infestation (especially red algae), cloudy water, stunted plant growth.<br\/><strong>Causes<\/strong>: Excess food, decomposition of organic matter, high PO4 levels in tap water.<br\/><strong>Solutions<\/strong>:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Phosphate removal cartridges<\/strong>: Formulations like Seachem PhosGuard or PhosBond bind PO4 and remove it from the water.<\/li>\n\n\n\n<li><strong>Limit food<\/strong>: Feed fish sparingly to reduce organic waste.<\/li>\n\n\n\n<li><strong>Testing tap water<\/strong>: If PO4 in tap water is high, use RO or distilled water.<\/li>\n\n\n\n<li><strong>Plants<\/strong>: Increase the planting of plants that efficiently take up phosphate, such as pistachio or limnobium.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\"><strong>Too low NO<\/strong><strong><sub>3<\/sub><\/strong><strong> or PO<\/strong><strong><sub>4<\/sub><\/strong><\/h3>\n\n<p><strong>Symptoms<\/strong>: Yellowing leaves, dwarfed plants, stunted growth.<br\/><strong>Causes<\/strong>: Too many plants with few fish, lack of fertilization, too frequent water changes.<br\/><strong>Solutions<\/strong>:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Fertilization<\/strong>: Use fertilizers with nitrates (such as <sub>KNO3<\/sub>) or phosphates (such as <sub>KH2PO4<\/sub>). Start with small doses and observe the plants&#8217; reaction.   <\/li>\n\n\n\n<li><strong>Reduce the frequency of water changes<\/strong>: If NO3 and <sub>PO4<\/sub> are near zero, limit your water changes to 5% per week.<\/li>\n\n\n\n<li><strong>Feeding fish<\/strong>: More fish or more frequent feeding can naturally raise <sub>NO3<\/sub> levels.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-1039334a53c6624a9496164b60f7b099\" style=\"color:#f1005d\"><strong>How to prevent NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO<\/strong><strong><sub>4<\/sub><\/strong><strong> ?<\/strong><\/h2>\n\n<p>Prevention is better than cure! Here are tips to keep nitrates and phosphates in check: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Regular testing<\/strong>: Monitor water parameters weekly to catch deviations quickly.<\/li>\n\n\n\n<li><strong>Proper fertilization<\/strong>: Adjust fertilizer dosages according to the needs of the plants. If you have a high-tech aquarium with<sub>CO2<\/sub> and strong lighting, you need more <sub>NO3<\/sub> and PO4<sub>than <\/sub>in low-tech. <\/li>\n\n\n\n<li><strong>Good filtration<\/strong>: a filter with a large biological surface area is home to bacteria that help with the nitrogen cycle.<\/li>\n\n\n\n<li><strong>Water changes<\/strong>: Regular, but not too large, water changes (10% per week) are the golden mean.<\/li>\n\n\n\n<li><strong>Cast balance<\/strong>: Too many fish means too much <sub>NO3<\/sub>. Too few &#8211; not enough nutrients for plants.   <\/li>\n\n\n\n<li><strong>Plants in the aquarium<\/strong>: the more plants, the better they do at absorbing <sub>NO3<\/sub> and <sub>PO4<\/sub>.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-92001ead19014f56e14d1d6b8e69718b\" style=\"color:#f1005d\"><strong>FAQ &#8211; frequently asked questions<\/strong><\/h2>\n\n<p><strong>1. whether NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO4 are harmful to fish?<\/strong><strong><br\/><\/strong>Nitrates at concentrations above 50 mg\/l can stress fish, especially sensitive species. Phosphates in themselves are not toxic, but an excess of them promotes algae that reduce water quality. <\/p>\n\n<p><strong>2. how to lower NO quickly<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO<\/strong><strong><sub>4<\/sub><\/strong><strong>?<\/strong><strong><br\/><\/strong>The fastest way is to change the water and use filter cartridges. Long-term, plants and good filtration will help. <\/p>\n\n<p><strong>3. why my plants are not growing, despite high NO<\/strong><strong><sub>3<\/sub><\/strong><strong> and PO<\/strong><strong><sub>4<\/sub><\/strong><strong>?<\/strong><strong><br\/><\/strong>There may be a lack of other components, such as potassium, iron or<sub>CO2<\/sub>. Also check that the ratio of <sub>NO3<\/sub> to <sub>PO4<\/sub> is appropriate (10-15:1). <\/p>\n\n<p><strong>4. can I use tap water?<\/strong><strong><br\/><\/strong>Yes, but test it for <sub>NO3<\/sub> and <sub>PO4<\/sub> first. If the levels are high, it is better to use RO water. <\/p>\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-12bb548afcd4013c7b19aba1931cb80e\" style=\"color:#f1005d\"><strong>Summary<\/strong><\/h2>\n\n<p class=\"has-link-color wp-elements-138b6869e7a107ee89d578f7cd68ccd4\">Nitrates and phosphates are an integral part of aquariums. They are like spices in the kitchen &#8211; in the right amounts they add flavor, but overdoing it can spoil the dish. The key is to test regularly, adjust fertilization and make sure the tank is balanced. Remember: every aquarium is different, so observe your plants, fish and water parameters. Over time, you will learn to sense what your tank needs. We hope this article has illuminated the topic of <sub>NO3<\/sub> and <sub>PO4<\/sub> for you. If you are looking for <a href=\"https:\/\/aquaforest.eu\/pl\/produkty_\/seawater\/testy-wody\/\">tests<\/a>, fertilizers or preparations to control the parameters, take a look at<a href=\"https:\/\/aquaforest.eu\/en\/all-product-categories\/\"> our store<\/a>, where we have everything you need to keep your aquarium healthy.      <\/p>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today we&#8217;re taking on two key elements that are causing quite a bit of excitement in the aquarium world: nitrates (NO3) and phosphates (PO4). If you&#8217;ve ever wondered why your aquarium looks like an algae plantation or why plants grow slower than you&#8217;d like, this article is for you. We&#8217;ll explain what NO3 and PO4 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":25297,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"doc_category":[1337,1349,1352,1363],"doc_tag":[1316,1755,1756],"class_list":["post-25301","docs","type-docs","status-publish","has-post-thumbnail","hentry","doc_category-filtration","doc_category-nitrate","doc_category-phosphate","doc_category-tests","doc_tag-blog","doc_tag-nitrate-testkit-2","doc_tag-phosphate-test-kit-2"],"acf":[],"year_month":"2026-04","word_count":1456,"total_views":"2535","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"klaudiusz.ruszaj@aquaforest.pl","author_nicename":"klaudiusz-ruszajaquaforest-pl","author_url":"https:\/\/aquaforest.eu\/en\/author\/klaudiusz-ruszajaquaforest-pl\/"},"doc_category_info":[{"term_name":"Filtration","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/filtration\/"},{"term_name":"Nitrate","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/nitrate\/"},{"term_name":"Phosphate","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/phosphate\/"},{"term_name":"Tests","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/tests\/"}],"doc_tag_info":[{"term_name":"Blog posts","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-tag\/blog\/"},{"term_name":"Nitrate TestKit","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-tag\/nitrate-testkit-2\/"},{"term_name":"Phosphate Test Kit","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-tag\/phosphate-test-kit-2\/"}],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NO3 and PO4 in the aquarium: a few words of explanation about nitrates and phosphates<\/title>\n<meta name=\"description\" content=\"Learn what NO3 and PO4 are in an aquarium, how they affect the aquarium. 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