{"product_id":"nyos-magnesium-reefer-test-kit-saltwater-reef","title":"Nyos Magnesium Reefer Test Kit | High-Precision Mg Titration for Saltwater Reef Aquariums","description":"\u003cp\u003eThe \u003cstrong\u003eNyos Magnesium Reefer Test Kit\u003c\/strong\u003e is a precision titration kit that measures magnesium (Mg) in saltwater reef aquariums down to \u003cstrong\u003e15 mg\/L resolution\u003c\/strong\u003e — sharp enough to spot a slow drift before calcium and alkalinity start to fall apart. Made in Germany with reagents calibrated against AAS and NIST standards, it delivers laboratory-grade accuracy at a hobbyist price. Browse our full \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003ewater testing kits collection\u003c\/a\u003e or explore other \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003esaltwater reef supplies\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Magnesium Matters in a Reef Tank\u003c\/h3\u003e\n\u003cp\u003eMagnesium is the third leg of the calcium \/ alkalinity \/ magnesium triangle. Without enough Mg, calcium carbonate precipitates out of solution and your Ca and KH crash together — even when you're dosing them. Magnesium is also a structural component of stony coral and coralline algae skeletons, so it directly drives growth, color, and skeleton density in SPS, LPS, and clams.\u003c\/p\u003e\n\u003cp\u003eMost reef hobbyists target \u003cstrong\u003e1280–1350 mg\/L\u003c\/strong\u003e (natural seawater is ~1280 mg\/L), and SPS-heavy tanks running 2-part, calcium reactors, or kalkwasser often aim for \u003cstrong\u003e1350–1450 mg\/L\u003c\/strong\u003e. Whatever your target, you can't hit it without testing — and you can't react to a drift you can't see.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e~50 tests per kit\u003c\/strong\u003e — months of weekly testing on a single tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15 mg\/L resolution\u003c\/strong\u003e — sharper than most hobby kits, catches slow drift early\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange up to 1600 mg\/L\u003c\/strong\u003e — covers natural seawater and elevated SPS reef levels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-part titration\u003c\/strong\u003e with sharp pink-to-blue endpoint — easy to read, no guesswork\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGerman-made reagents\u003c\/strong\u003e calibrated against AAS and NIST standards (EN ISO 9001)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibrated dropper and precision syringes\u003c\/strong\u003e for repeatable drop volume across tests\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for marine water\u003c\/strong\u003e — reagents account for interfering ions in saltwater\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow to Test\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eFill the supplied test vial to the marked line with tank water using the syringe.\u003c\/li\u003e\n\u003cli\u003eAdd Reagent \u003cstrong\u003eMG-1\u003c\/strong\u003e per the included pictogram instructions and swirl.\u003c\/li\u003e\n\u003cli\u003eAdd the measured scoop of \u003cstrong\u003eMG-2\u003c\/strong\u003e powder and swirl until dissolved — the sample turns pink.\u003c\/li\u003e\n\u003cli\u003eTitrate \u003cstrong\u003eMG-3\u003c\/strong\u003e drop by drop, swirling after each drop, until the color shifts from pink to clear blue.\u003c\/li\u003e\n\u003cli\u003eRead the magnesium concentration directly from the syringe scale.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eFor tanks dosing 2-part, calcium reactors, or kalkwasser, test \u003cstrong\u003eweekly\u003c\/strong\u003e. Stable, lightly stocked reef systems can usually get away with testing every 1–2 weeks — magnesium drops slowly compared to calcium and alkalinity.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; max-width: 600px;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold; width: 40%;\"\u003eParameter Tested\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMagnesium (Mg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eWater Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSaltwater \/ Reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eMethod\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eThree-part titration (pink-to-blue endpoint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eTests per Kit\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e~50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eMeasurement Range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eUp to 1600 mg\/L (higher with dilution)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eResolution\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e15 mg\/L per scale division\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eReef Target Range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e1280–1450 mg\/L (NSW ~1280)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eWhat's Included\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e3 reagent bottles (MG-1 50 mL, MG-2 5 g powder, MG-3 50 mL), 3 precision syringes, measuring spoon, test vial, calibrated dropper, instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNyos (Germany)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px; font-weight: bold;\"\u003eSKU\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eTR-MAG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-reef-foundation-pro-multi-test-kit-ca-alk-mg\"\u003eRed Sea Reef Foundation Pro Multi Test Kit (Ca, Alk, Mg)\u003c\/a\u003e — round out a full reef-parameter testing setup\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-calcium-pro-test-kit\"\u003eRed Sea Calcium Pro Test Kit\u003c\/a\u003e — pair Mg testing with calcium for the full picture\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/salifert-kh-alkalinity-test-kit\"\u003eSalifert KH \/ Alkalinity Test Kit\u003c\/a\u003e — KH is the third leg of the triangle, test it alongside Mg and Ca\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-reef-foundation-c-magnesium-mg-500-ml-liquid\"\u003eRed Sea Reef Foundation C — Magnesium 500 mL\u003c\/a\u003e — dose this if your Mg comes back low\u003c\/li\u003e\n\u003cli\u003eBrowse all \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003ereef additives and supplements\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I test magnesium?\u003c\/strong\u003e\u003cbr\u003e\nWeekly is ideal for SPS-dominant tanks or any system actively dosing 2-part, calcium reactor effluent, or kalkwasser. Stable mixed reefs and softie tanks can usually test every 1–2 weeks. Magnesium falls slowly compared to Ca and Alk, but if it crashes, your other parameters will follow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's the ideal magnesium level for a reef tank?\u003c\/strong\u003e\u003cbr\u003e\nNatural seawater sits around 1280 mg\/L. Most reefers target 1280–1350 mg\/L for mixed reefs, and 1350–1450 mg\/L for SPS-heavy systems running elevated calcium and alkalinity. Anything below ~1200 mg\/L starts to cause Ca\/Alk instability.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow is this different from a Hanna or Salifert magnesium test?\u003c\/strong\u003e\u003cbr\u003e\nThe Nyos kit uses a true titration with a sharp pink-to-blue endpoint and 15 mg\/L resolution — finer than most hobby titration kits, and the endpoint is easier to read than a fading color match. Reagents are German-made and calibrated against laboratory standards, so batch-to-batch consistency is excellent.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the kit work for freshwater?\u003c\/strong\u003e\u003cbr\u003e\nNo. The reagents are formulated for saltwater chemistry — interfering ions in marine water are accounted for. Use a freshwater-specific magnesium kit if you're testing planted-tank or African cichlid water.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow long do the reagents last?\u003c\/strong\u003e\u003cbr\u003e\nSealed and stored at room temperature out of direct sunlight, Nyos reagents typically remain accurate for 1–2 years. Once opened, use within ~12 months for best precision and replace if the color of MG-1 or MG-3 looks off.\u003c\/p\u003e","brand":"Nyos","offers":[{"title":"Default Title","offer_id":48736511099099,"sku":"TR-MAG","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_71ba4b7a-9187-47ff-ae50-1d49f4892bb4.png?v=1777726780","url":"https:\/\/squeakysaquatics.com\/products\/nyos-magnesium-reefer-test-kit-saltwater-reef","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}