{"product_id":"red-sea-coralline-gro","title":"Red Sea Coralline Gro","description":"\u003cp\u003e\u003cstrong\u003eCoralline spreads when the chemistry suits it, not when you wish.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRed Sea KH Coralline Gro is a liquid marine buffer and trace supplement from Red Sea's Marine Care Program. Red Sea describes it as a complex of carbonate buffers, potassium and trace elements such as iron, formulated in the ratio taken up regularly by coralline algae — so it lifts alkalinity and restocks minor elements in the same dose. One millilitre raises the alkalinity of 100 litres by 0.1 dKH. It is intended for fish-only and soft coral systems, and for cycling new marine aquariums.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffer and trace elements in one bottle\u003c\/strong\u003e — carbonate buffers, potassium and trace elements including iron, in the proportions Red Sea states coralline algae consume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA published dose response\u003c\/strong\u003e — 1 mL raises alkalinity in 100 L by 0.1 dKH (0.03 meq\/L), so you dose against a test result instead of guessing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces Reef Foundation B in these systems\u003c\/strong\u003e — Red Sea specifies KH Coralline Gro instead of the Foundation B buffer while cycling a new marine tank, and on an ongoing basis in fish-only or soft coral systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoralline competes with nuisance algae\u003c\/strong\u003e — Red Sea's stated rationale is that encrusting coralline takes up the nutrients and rock surface pest algae would otherwise use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree pack sizes, one formulation\u003c\/strong\u003e — 100 mL, 500 mL and 5 L all dose at the same rate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct\u003c\/th\u003e\n\u003ctd\u003eRed Sea KH Coralline Gro — Marine Buffer \u0026amp; Trace Supplement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRed Sea program\u003c\/th\u003e\n\u003ctd\u003eMarine Care Program\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComposition (Red Sea's wording)\u003c\/th\u003e\n\u003ctd\u003eCarbonate buffers, potassium and trace elements such as iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDose response\u003c\/th\u003e\n\u003ctd\u003e1 mL raises alkalinity of 100 L by 0.1 dKH (0.03 meq\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum daily alkalinity change\u003c\/th\u003e\n\u003ctd\u003e0.5 meq\/L (1.4 dKH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget alkalinity\u003c\/th\u003e\n\u003ctd\u003eApproximately 3 meq\/L (8.4 dKH) in fish-only and soft coral systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eMarine — fish-only, soft coral, and new tank cycling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDo not use with\u003c\/th\u003e\n\u003ctd\u003eRed Sea Foundation ABC+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack sizes\u003c\/th\u003e\n\u003ctd\u003e100 mL, 500 mL, 5 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMatching test kit\u003c\/th\u003e\n\u003ctd\u003eRed Sea Reef Foundation KH\/Alkalinity Pro, resolution 0.05 meq\/L (0.14 dKH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhich size do I need?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003cth\u003eWho it suits\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e100 mL\u003c\/th\u003e\n\u003ctd\u003eRED309\u003c\/td\u003e\n\u003ctd\u003eTrialling the product, or a nano marine tank that would not finish a larger bottle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e500 mL\u003c\/th\u003e\n\u003ctd\u003eRED291\u003c\/td\u003e\n\u003ctd\u003eThe standard size for most fish-only and soft coral systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5 L\u003c\/th\u003e\n\u003ctd\u003eRED291a\u003c\/td\u003e\n\u003ctd\u003eLarge systems dosing daily. Red Sea's own website publishes 100 mL and 500 mL only, so treat the 5 L as a distributor pack size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe formulation and the dose rate are identical across all three. Size is only a question of how quickly you get through it.\u003c\/p\u003e\n\n\u003ch3\u003eDosage and directions\u003c\/h3\u003e\n\u003cp\u003eRed Sea does not publish a fixed millilitres-per-litre dose. The dose is derived from your own alkalinity test, because you are replacing what the tank has consumed.\u003c\/p\u003e\n\u003ch4\u003eSetting the daily dose\u003c\/h4\u003e\n\u003cp\u003eRed Sea's procedure for boosting coralline algae, from the product manual:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eRun the aquarium for four days at stable salinity, compensating for evaporation daily, without adding any supplements.\u003c\/li\u003e\n\u003cli\u003eTest alkalinity and calculate the dose needed to bring it back to target. That is the four-day dosage.\u003c\/li\u003e\n\u003cli\u003eAdd the four-day dosage to the system. Divide it by four and use that as the daily dose for the next week.\u003c\/li\u003e\n\u003cli\u003eAfter a week of daily dosing, test again and adjust.\u003c\/li\u003e\n\u003cli\u003eKeep testing weekly and adjusting the daily dose as required.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch4\u003eThe rules that matter\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCheck salinity and correct it before testing alkalinity, then wait 10 minutes for the water to stabilise.\u003c\/li\u003e\n\u003cli\u003eNever move alkalinity by more than 0.5 meq\/L (1.4 dKH) in one day. Faster than that stresses corals.\u003c\/li\u003e\n\u003cli\u003eAdd it to the sump. With no sump, add it slowly into an area of high flow so it never contacts corals directly.\u003c\/li\u003e\n\u003cli\u003eIf you miss a day or more, add the full missed amount — but not where that would breach the daily ceiling above.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003ch4\u003eSuitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCycling a new marine aquarium, where Red Sea specifies it in place of Foundation B\u003c\/li\u003e\n\u003cli\u003eFish-only marine systems\u003c\/li\u003e\n\u003cli\u003eSoft coral systems\u003c\/li\u003e\n\u003cli\u003eEncouraging coralline onto bare rock, returns and overflow boxes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNot suitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse alongside Red Sea Foundation ABC+.\u003c\/strong\u003e Red Sea states the two should not be used in conjunction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef systems already dosed for hard corals.\u003c\/strong\u003e Red Sea is blunt about this: coralline algae will grow naturally, without any special supplements, in all reef systems optimised for hard corals. If calcium, alkalinity and magnesium are already held at stony coral levels and you supplement trace elements, this product has nothing to add.\u003c\/li\u003e\n\u003cli\u003eFreshwater aquariums. This is a marine formulation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-kh-alkalinity-pro-testing-kit-75-tests\"\u003eRed Sea KH\/Alkalinity Pro Test Kit\u003c\/a\u003e — the kit Red Sea names for measuring the drop this product replaces. Its 0.05 meq\/L resolution is what makes the four-day method work.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-marine-care-multi-test-kit\"\u003eRed Sea Marine Care Multi Test Kit\u003c\/a\u003e — pH, ammonia, nitrite and nitrate, for the cycling period when you would be dosing this.\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 — low magnesium is the usual reason alkalinity will not hold its level.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-marine-care-calcium-test-kit\"\u003eRed Sea Marine Care Calcium Test Kit\u003c\/a\u003e — calcium and alkalinity move together and are best read as a pair.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-salt-20kg-refill-box-600ltr\"\u003eRed Sea Coral Pro Salt\u003c\/a\u003e — start water changes from a known alkalinity baseline.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eRed Sea's 24-month warranty covers manufacturing defects in its aquarium products and expressly excludes consumable items. Red Sea publishes no separate warranty term for its supplements. Any manufacturer warranty is in addition to your rights under the Australian Consumer Law and does not limit them.\u003c\/p\u003e\n\u003cp\u003eRed Sea does not publish storage conditions, a shelf life or a safety data sheet for KH Coralline Gro, so this page does not state one. If you need a dangerous goods or air freight classification for the 5 L, contact us before ordering and we will confirm it with the distributor.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eHow much Red Sea KH Coralline Gro do I add per litre?\u003c\/h4\u003e\n\u003cp\u003eThere is no fixed per-litre dose. Red Sea sets the dose from a measured alkalinity drop: 1 mL of KH Coralline Gro raises the alkalinity of 100 litres of aquarium water by 0.1 dKH, so you test, calculate the shortfall against your target, and dose to close it — never moving alkalinity more than 0.5 meq\/L (1.4 dKH) in a single day.\u003c\/p\u003e\n\u003ch4\u003eCan I use KH Coralline Gro and Red Sea Foundation ABC+ together?\u003c\/h4\u003e\n\u003cp\u003eNo. Red Sea states in the KH Coralline Gro manual that it should not be used in conjunction with Red Sea Foundation ABC+. KH Coralline Gro is used instead of the Reef Foundation B buffer, not alongside the full Foundation program.\u003c\/p\u003e\n\u003ch4\u003eDo I need KH Coralline Gro if I run a hard coral reef?\u003c\/h4\u003e\n\u003cp\u003eUsually not. Red Sea states that coralline algae will grow naturally, without any special supplements, in all reef systems optimised for hard corals — meaning systems where calcium, carbonates and magnesium are held at stony coral levels and trace elements are already supplemented. KH Coralline Gro is aimed at fish-only systems, soft coral systems and new tanks being cycled.\u003c\/p\u003e\n\u003ch4\u003eWhat alkalinity should I be aiming for?\u003c\/h4\u003e\n\u003cp\u003eRed Sea specifies approximately 3 meq\/L, which is 8.4 dKH, to promote coralline algae in fish-only and soft coral aquariums. That is deliberately lower than the 11 to 12 dKH many stony coral keepers run.\u003c\/p\u003e\n\u003ch4\u003eWhich test kit should I use with it?\u003c\/h4\u003e\n\u003cp\u003eRed Sea names its Reef Foundation KH\/Alkalinity Pro Test Kit, which resolves to 0.05 meq\/L (0.14 dKH) across 75 tests. That resolution matters, because the dosing method depends on detecting a small alkalinity drop over four days.\u003c\/p\u003e\n\u003ch4\u003eWhere in the tank do I add it?\u003c\/h4\u003e\n\u003cp\u003eInto the sump. If the system has no sump, Red Sea says to add the supplement slowly into an area of high water flow to prevent direct contact with the corals.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"500ml","offer_id":54774153609507,"sku":"RED291","price":27.0,"currency_code":"AUD","in_stock":false},{"title":"100ml","offer_id":55335170277667,"sku":"RED309","price":13.0,"currency_code":"AUD","in_stock":true},{"title":"5ltr","offer_id":55335170310435,"sku":"RED291a","price":255.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Red_Sea_Marine_Care_-_KH_Coralline_Gro.jpg?v=1782112532","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-coralline-gro","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}