{"product_id":"red-sea-marine-care-calcium-test-kit","title":"Red Sea Marine Care Calcium Test Kit","description":"\u003cp\u003e\u003cstrong\u003eKnow your calcium before you dose blind.\u003c\/strong\u003e The Red Sea Marine Care Calcium Test Kit measures calcium in marine and reef aquariums using a syringe-based titration — count the drops, read the number straight off the syringe, no colour matching to squint at. Calcium is the number one building block for coral and coralline growth, and it drops fastest in the tanks doing the most growing.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e75 titration tests per kit\u003c\/strong\u003e — enough for weekly testing in a busy reef tank for well over a year.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelectable resolution\u003c\/strong\u003e — read to 30 ppm for a quick weekly check, or 15 ppm when you need to confirm a dosing change actually moved the number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitration method\u003c\/strong\u003e — a 5 mL syringe doses reagent drop by drop until the sample changes colour; the drop count is the reading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversion chart included\u003c\/strong\u003e — the drop count reads straight across to ppm without doing the maths yourself.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasures\u003c\/td\u003e\n\u003ctd\u003eCalcium (Ca)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethod\u003c\/td\u003e\n\u003ctd\u003eTitration (syringe drop-count)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003eSelectable 15 ppm or 30 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTests per kit\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater type\u003c\/td\u003e\n\u003ctd\u003eMarine and reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eSealed, 15–25°C, use before the expiry date printed on the pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhat's included \/ Not included\u003c\/h3\u003e\u003cp\u003eThe kit includes Reagent A (25 mL), Reagent B (20 g), Reagent C (50 mL), a 5 mL syringe, a glass test vial, a measuring spoon and printed instructions with a conversion chart — everything needed for 75 tests. It does not include a magnesium or alkalinity test — calcium, alkalinity and magnesium move together in a reef tank, and testing only one gives an incomplete picture.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for fish-only, mixed reef and SPS-dominated marine systems — anywhere coralline algae, corals or clams are drawing calcium out of the water. Less useful on a fish-only tank with no calcifying life, where calcium rarely needs tracking.\u003c\/p\u003e\u003ch3\u003eTarget ranges\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSystem type\u003c\/th\u003e\n\u003cth\u003eTarget calcium\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFOWLR (fish only with live rock)\u003c\/td\u003e\n\u003ctd\u003e380–420 mg\/L — stability matters more than hitting a specific number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixed reef \/ soft and LPS coral\u003c\/td\u003e\n\u003ctd\u003e400–450 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPS-dominated reef\u003c\/td\u003e\n\u003ctd\u003e420–450 mg\/L, held alongside alkalinity 7–9 dKH and magnesium 1,300–1,400 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThese are marine and reef target ranges. Calcium is not a parameter tracked in freshwater community, planted or African cichlid tanks, so no freshwater target range applies to this kit.\u003c\/p\u003e\u003ch3\u003eWhat to do when the reading is out of range\u003c\/h3\u003e\u003cp\u003eLow calcium is corrected with a calcium supplement such as \u003ca href=\"\/products\/red-sea-reef-care-calcium-foundation-a\"\u003eRed Sea Reef Care Calcium+ Foundation A\u003c\/a\u003e, dosed alongside alkalinity and magnesium rather than on its own — moving one element without the others throws off the balance between them. Retest a few days after any dosing change rather than the same day; calcium takes time to equilibrate.\u003c\/p\u003e\u003ch3\u003eCare and storage\u003c\/h3\u003e\u003cp\u003eKeep sealed, store between 15–25°C out of direct sun, and check the expiry date printed on the pack before trusting an older kit's result.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by the consumer guarantees under Australian Consumer Law, in addition to any manufacturer undertaking. Standard parcel freight — no special handling required.\u003c\/p\u003e\u003ch3\u003eGoes well with\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-kh-alkalinity-pro-testing-kit-75-tests\"\u003eRed Sea KH\/Alkalinity Pro Testing Kit\u003c\/a\u003e — test alongside calcium; the two parameters move together.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-marine-care-magnesium-test-kit\"\u003eRed Sea Marine Care Magnesium Test Kit\u003c\/a\u003e — magnesium stabilises both calcium and alkalinity.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-reef-care-calcium-foundation-a\"\u003eRed Sea Reef Care Calcium+ Foundation A\u003c\/a\u003e — the matching dosing solution when calcium reads low.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow often should I test calcium?\u003c\/h4\u003e\u003cp\u003eWeekly in a growing reef tank, fortnightly to monthly in a stable fish-only or soft-coral system.\u003c\/p\u003e\u003ch4\u003eWhy does my calcium keep dropping?\u003c\/h4\u003e\u003cp\u003eGrowing coral and coralline algae consume calcium continuously — the more growth in the tank, the faster it needs replacing.\u003c\/p\u003e\u003ch4\u003eShould I test calcium on its own, or with alkalinity and magnesium?\u003c\/h4\u003e\u003cp\u003eTest all three together where possible. Calcium and alkalinity are inversely linked through the calcification process, and magnesium keeps both in solution — a change in one without checking the others can send you chasing the wrong number.\u003c\/p\u003e\u003ch4\u003eCan I use this kit on a freshwater planted tank?\u003c\/h4\u003e\u003cp\u003eIt's formulated and calibrated for marine calcium ranges (350–500+ mg\/L) and isn't the right tool for the much lower calcium levels relevant to freshwater planted tanks.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774153740579,"sku":"RED295","price":40.5,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-marine-care-calcium-test-kit-3003779-1600.jpg?v=1781836189","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-marine-care-calcium-test-kit","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}