{"id":22205,"date":"2025-03-31T14:59:55","date_gmt":"2025-03-31T12:59:55","guid":{"rendered":"https:\/\/aquaforest.eu\/?post_type=docs&#038;p=22205"},"modified":"2025-12-02T15:16:47","modified_gmt":"2025-12-02T14:16:47","password":"","slug":"water-change-in-a-reef-aquarium-how-to-do-it-safely","status":"publish","type":"docs","link":"https:\/\/aquaforest.eu\/en\/knowledge-base\/water-change-in-a-reef-aquarium-how-to-do-it-safely\/","title":{"rendered":"Water change in a reef aquarium &#8211; how to do it safely? | Resources | Blog about aquarium | Aquaforest"},"content":{"rendered":"\n<p>Water change is one of the most essential tasks in maintaining reef aquariums, which are among the most stunning ecosystems. Keeping corals and other marine life thriving requires meticulous control of water parameters, with regular water changes playing a crucial role in sustaining a stable environment.<\/p>\n\n\n\n<p>However, an improper approach to this task can disrupt the delicate biological balance, leading to stress\u2014or even fatalities\u2014among the tank\u2019s inhabitants. So how can you ensure that a water change benefits rather than harms your reef ecosystem? In this article, we\u2019ll explore essential guidelines and practical tips to help you maintain a pristine, thriving saltwater aquarium.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-123243b809399874b71a70ded5d87a45\" style=\"color:#f1005d\">Why is a regular water change in an aquarium essential?<\/h2>\n\n\n\n<p>Over time, the water in a reef aquarium gradually loses its essential properties. The buildup of metabolic waste, uneaten food, toxins, and a depletion of vital trace elements can have a detrimental impact on marine life. Regular water changes play a key role in maintaining a healthy ecosystem by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Removing excess contaminants<\/strong> \u2013 such as nitrates, phosphates, heavy metals (if supplemented), and detritus.<\/li>\n\n\n\n<li><strong>Replenishing micro- and macroelements<\/strong> \u2013 corals, mollusks, and other marine organisms consume essential minerals like calcium, magnesium, and strontium.<\/li>\n\n\n\n<li><strong>Stabilizing water parameters<\/strong> \u2013 helping maintain optimal pH, salinity, and mineral levels.<\/li>\n\n\n\n<li><strong>Enhancing the well-being of aquarium inhabitants<\/strong> \u2013 fresh water promotes the healthy growth of corals and fish while reducing algae blooms and harmful pathogens.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-3c2298c28c60b7b7ad673cd882b53335\" style=\"color:#f1005d\">How often should I change the water in a marine aquarium?<\/h2>\n\n\n\n<p>How often you should perform water changes depends on the size of the aquarium, its stocking density and feeding intensity. The water to be changed should have the same parameters as the aquarium water, in particular temperature, salinity and chemical composition to avoid stressing. The following rules are generally accepted depending on size:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>in small aquaria (up to 100 litres) &#8211; it is recommended to change about 10-15% of the volume of water every week,<\/li>\n\n\n\n<li>in medium-sized aquaria (100-300 litres) &#8211; change 10% of the water every 1-2 weeks,<\/li>\n\n\n\n<li>in large aquaria (over 300 litres) &#8211; 5-10% of the water every fortnight.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-link-color wp-elements-622685ee545125ba914c088d7649d962\">If the aquarium has a high biological load\u2014such as a large number of fish, corals, or crustaceans\u2014more frequent tank water changes may be necessary. Regularly monitoring key chemical parameters NO\u2083, PO\u2084, pH, KH, Ca, Mg. For this, our <a href=\"https:\/\/aquaforest.eu\/en\/products_\/seawater\/water-tests\/\">drop tests<\/a> and ICP tests will work great. It allows you to adjust the schedule as needed, ensuring optimal conditions for your reef ecosystem.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-1024x349.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"349\" src=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-1024x349.jpg\" alt=\"Banner with ICP Test from Aquaforest\" class=\"wp-image-22210\" srcset=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-1024x349.jpg 1024w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-300x102.jpg 300w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-768x262.jpg 768w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-360x123.jpg 360w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1-600x204.jpg 600w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/ICP-test-banner-ENG-1.jpg 1180w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-065fb76c797d5dcb0e6028a28303f8fb\" style=\"color:#f1005d\">How much water should I change to keep it safe?<\/h2>\n\n\n\n<p>Changing too much water at once can cause sudden shifts in parameters, which may disrupt the aquarium\u2019s delicate balance. A safe rule of thumb is to replace around <strong>15% of the tank\u2019s volume at a time<\/strong>.<\/p>\n\n\n\n<p>However, if the water is heavily polluted, it\u2019s best to perform <strong>several smaller water changes<\/strong> over a short period rather than one large one.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-3155fc05d9986c003aecbe44cf7380e4\" style=\"color:#f1005d\">Which water should be used for water changes?<\/h2>\n\n\n\n<p>Ordinary tap water is unsuitable for reef aquariums, as it may contain chlorine, heavy metals, and other impurities harmful to marine life. Instead, the best choice is <strong>purified RODI water<\/strong> (reverse osmosis with deionization), to which a high-quality <strong>aquarium salt mix<\/strong> is added. This ensures the water remains free of contaminants and provides the necessary balance of minerals for a thriving reef ecosystem.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Water change with AF Perfect Water\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/I-_VtAF49e4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-c0b963560f4c3dfe8dfbf00a226b1135\" style=\"color:#f1005d\">How to prepare for a water change in a reef aquarium<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Water filtration<\/strong> \u2013 use <strong>RODI water<\/strong> with a <strong>TDS (Total Dissolved Solids) reading close to zero<\/strong>, ensuring no unwanted dissolved substances.<\/li>\n\n\n\n<li class=\"has-link-color wp-elements-5f3513ee8b43780c33c7d9308983f8e9\"><strong>Adding salt<\/strong> \u2013 choose <strong>high-quality aquarium salt<\/strong> and dissolve it according to the manufacturer&#8217;s recommendations. To this end, we encourage you to take a look at our range of <a href=\"https:\/\/aquaforest.eu\/en\/products_\/seawater\/marine-salts\/\">aquarium salts<\/a>.<\/li>\n\n\n\n<li><strong>Checking salinity<\/strong> \u2013 the ideal salinity for a reef aquarium is <strong>1.025-1.026 g\/cm\u00b3 (33-35 ppt)<\/strong>, measured with a <strong>refractometer or hydrometer<\/strong>. Keep in mind that these values can slightly vary depending on the species in your tank, so always check their specific requirements.<\/li>\n\n\n\n<li><strong>Warming the water<\/strong> \u2013 ensure the new saltwater is at a temperature close to that of the aquarium\u2014<strong>around 24-26\u00b0C<\/strong>.<\/li>\n\n\n\n<li><strong>Aeration and mixing<\/strong> \u2013 stir the fresh saltwater for several hours using a <strong>circulation pump<\/strong> to fully dissolve the salt and stabilize the parameters before adding it to the tank<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-1024x1024.jpg\"><img decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-1024x1024.jpg\" alt=\"Aquaforest salt banner - Hybrid Pro Salt, Reef Salt, Reef Salt Plus and Sea Salt. Salts for weekly water changes.\" class=\"wp-image-22195\" srcset=\"https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-1024x1024.jpg 1024w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-300x300.jpg 300w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-150x150.jpg 150w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-768x768.jpg 768w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-1536x1536.jpg 1536w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-360x360.jpg 360w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-600x600.jpg 600w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1-100x100.jpg 100w, https:\/\/aquaforest.eu\/wp-content\/uploads\/2025\/03\/af_marine_salts_2-1.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-c1b2004d18a4797d8aae03cd735e81af\" style=\"color:#f1005d\">How to properly change water?<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Turn off the equipment<\/strong> \u2013 before starting, switch off the <strong>circulation pump and skimmer<\/strong> to prevent water splashing and unnecessary turbulence.<\/li>\n\n\n\n<li><strong>Remove old water<\/strong> \u2013 use a <strong>long hose<\/strong> to pump the old water from the tank, focusing on collecting sediment from the bottom.<\/li>\n\n\n\n<li><strong>Slowly add new saltwater<\/strong> \u2013 gradually refill the tank with <strong>clean, pre-mixed saltwater<\/strong>, ideally using a <strong>pump or hose with a control valve<\/strong> to prevent sudden parameter fluctuations.<\/li>\n\n\n\n<li><strong>Restart equipment<\/strong> \u2013 Once the water change is complete, turn <strong>all equipment<\/strong> back on and monitor water parameters for the next few hours to ensure stability.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-aae4a337f7531426030ad8b65e54532c\" style=\"color:#f1005d\">What should I avoid during water changes?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Changing too much water at once<\/strong> \u2013 large water changes can cause <strong>osmotic shock<\/strong>, stressing marine organisms.<\/li>\n\n\n\n<li><strong>Replacing water too quickly<\/strong> \u2013 rapid changes in <strong>temperature and salinity<\/strong> can destabilize the ecosystem.<\/li>\n\n\n\n<li><strong>Using untreated water<\/strong> \u2013 tap water contains <strong>chlorine and heavy metals<\/strong>, which are harmful to marine life.<\/li>\n\n\n\n<li><strong>Incorrect salinity levels<\/strong> \u2013 even small deviations can be <strong>stressful for corals<\/strong> and other sensitive organisms.<\/li>\n\n\n\n<li><strong>Failing to monitor water parameters after the change<\/strong> \u2013 regular testing helps detect imbalances early and prevents potential issues.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-cb95853142a332992ddc3c3e31db043e\" style=\"color:#f1005d\">Additional tips for reef tank maintenance (not only for newer reefers):<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Maintain ecosystem stability<\/strong> \u2013 water changes are just one part of reef care. Proper <strong>filtration, lighting, and nutrition<\/strong> are equally important.<\/li>\n\n\n\n<li><strong>Keep an aquarium log<\/strong> \u2013 tracking <strong>water changes, parameters, and adjustments<\/strong> helps refine your maintenance routine.<\/li>\n\n\n\n<li><strong>Be patient<\/strong> \u2013 sudden changes can <strong>harm your tank\u2019s inhabitants<\/strong>. Make adjustments gradually and observe their reactions.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-f1acb4c385d000b89db7a8ce0a04d5f6\" style=\"color:#f1005d\">Summary<\/h2>\n\n\n\n<p>Regular, well-executed water changes are essential for a healthy reef aquarium. By properly preparing new water, following best practices, and avoiding common mistakes. You can maintain stable conditions for fish, corals, and other marine organisms. High water quality is the foundation of successful reefkeeping. The better the environment you create, the more stunning your reef will become!<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Water change is one of the most essential tasks in maintaining reef aquariums, which are among the most stunning ecosystems. Keeping corals and other marine life thriving requires meticulous control of water parameters, with regular water changes playing a crucial role in sustaining a stable environment. However, an improper approach to this task can disrupt [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":22207,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"doc_category":[1328,1364],"doc_tag":[1316,503],"class_list":["post-22205","docs","type-docs","status-publish","has-post-thumbnail","hentry","doc_category-choice-of-salt","doc_category-water-changes","doc_tag-blog","doc_tag-marine-salt"],"acf":[],"year_month":"2026-04","word_count":1012,"total_views":"3254","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"krzysztof.mandecki@aquaforest.pl","author_nicename":"krzysztof-mandeckiaquaforest-pl","author_url":"https:\/\/aquaforest.eu\/en\/author\/krzysztof-mandeckiaquaforest-pl\/"},"doc_category_info":[{"term_name":"Choice of salt","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/choice-of-salt\/"},{"term_name":"Water changes","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-category\/water-changes\/"}],"doc_tag_info":[{"term_name":"Blog posts","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-tag\/blog\/"},{"term_name":"Marine salt","term_url":"https:\/\/aquaforest.eu\/en\/knowledge-base-tag\/marine-salt\/"}],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Water change in a reef aquarium - how to do it safely? | Aquaforest<\/title>\n<meta name=\"description\" content=\"How to safely perform water change in an aquarium? 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