{"product_id":"waterbox-magnesium-500ml-reef-supplement","title":"Waterbox Magnesium 500mL","description":"\u003cdiv style=\"font-family:Georgia,serif;color:#1a1a1a;max-width:860px;line-height:1.7;\"\u003e\n\u003cdiv style=\"background:#E0F7FA;border-left:4px solid #006064;padding:10px 14px;margin:0 0 14px;font-size:0.95em;\"\u003e\n\u003cstrong\u003eIn-store pickup only.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWaterbox Magnesium\u003c\/strong\u003e is a concentrated liquid Core Element supplement that keeps magnesium in the ideal range for a thriving reef. Magnesium is the element that lets your tank hold proper calcium and alkalinity levels, so when it drifts low, everything else becomes hard to keep stable. Dosing this supplement keeps calcium and alkalinity working together, which drives better coral growth and overall reef health. Part of the Waterbox Method lineup, made under strict lab conditions. Pair it with the rest of our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003ereef additives and supplements\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eWhy Magnesium Matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnlocks calcium and alkalinity:\u003c\/strong\u003e proper magnesium prevents calcium and alkalinity from precipitating out, so your other supplements actually stay in solution and available to corals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrives coral growth:\u003c\/strong\u003e stable magnesium supports the skeletal growth and color of stony corals and clams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrects the hidden culprit:\u003c\/strong\u003e when calcium and alkalinity refuse to hold no matter how you dose, low magnesium is usually the reason.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentrated and clean:\u003c\/strong\u003e a Waterbox Method formula produced under strict laboratory conditions from high-purity ingredients.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eDosing\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDose rate:\u003c\/strong\u003e 5 mL raises magnesium by about 3.75 ppm in 25 gallons (100 L).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget range:\u003c\/strong\u003e the Waterbox Method recommends keeping magnesium at 1200 to 1400 ppm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to dose:\u003c\/strong\u003e add to a high-flow area of the sump or display. Test first, then raise gradually rather than all at once, and retest after dosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest regularly:\u003c\/strong\u003e confirm your level with a \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-magnesium-test-kit\"\u003emagnesium test kit\u003c\/a\u003e before and after adjusting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003eWaterbox Magnesium (Core Element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eVolume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e500 mL (16.9 fl oz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003eRaises and maintains magnesium in reef aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eDose Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e5 mL per 25 gal raises Mg ~3.75 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eTarget\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e1200 to 1400 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eWater Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003eSaltwater \/ Reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #B2EBF2;\"\u003eWaterbox Aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-magnesium-test-kit\"\u003eRed Sea Magnesium Test Kit\u003c\/a\u003e, so you dose to a number instead of guessing\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-reef-code-a-calcium\"\u003eBrightwell Reef Code A (Calcium)\u003c\/a\u003e and \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-reef-code-b-alkalinity\"\u003eReef Code B (Alkalinity)\u003c\/a\u003e, the two elements magnesium keeps in balance\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/waterbox-magnetic-glass-cleaner\"\u003eWaterbox Magnetic Glass Cleaner\u003c\/a\u003e, more Waterbox gear for tank upkeep\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003eAdditives \u0026amp; Supplements\u003c\/a\u003e, the full reef dosing lineup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I dose magnesium?\u003c\/strong\u003e\u003cbr\u003e\nWhenever a test shows you below the 1200 to 1400 ppm range, or when your calcium and alkalinity will not hold steady despite regular dosing. Low magnesium is the usual reason those two drift.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much will one bottle raise my tank?\u003c\/strong\u003e\u003cbr\u003e\nAt 5 mL per 25 gallons for roughly 3.75 ppm, a 500 mL bottle covers a meaningful correction on most home reefs. Always test, raise gradually, and retest.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it reef safe?\u003c\/strong\u003e\u003cbr\u003e\nYes. It is formulated specifically for reef aquariums with corals, clams, and invertebrates.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Waterbox","offers":[{"title":"Default Title","offer_id":48935051067611,"sku":"39330","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_c8a71210-658f-4d0d-83a8-d11bd3630673.jpg?v=1782999681","url":"https:\/\/squeakysaquatics.com\/products\/waterbox-magnesium-500ml-reef-supplement","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}