{"product_id":"red-sea-reef-care-4-part-rcp-large-600ltr","title":"Red Sea Reef Care 4 Part RCP Large 600ltr","description":"\u003cp\u003e\u003cstrong\u003eOne coordinated dosing program covers calcium, alkalinity, magnesium and all the trace elements a 600 L reef consumes.\u003c\/strong\u003e The Red Sea 4-Part RCP (Reef Care Program) — Large pack — supplies four proportioned bottles sized to run a mixed reef up to 600 L for roughly three months, so major and trace elements are replenished in the same balance corals draw them from the water.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour parts, one ratio\u003c\/strong\u003e — Part 1 (Calcium \u0026amp; Magnesium+), Part 2 (Alkalinity\/KH \u0026amp; pH stabiliser), Part 3 (Iodine \u0026amp; Potassium) and Part 4 (Iron \u0026amp; Bioactive Elements) are bottled in the proportions a reef actually consumes them, so all four bottles run out together instead of one running dry early.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for reefs to 600 L\u003c\/strong\u003e — the Large pack is built around roughly three months of daily dosing for a mixed reef at that volume; smaller or larger reefs use the dose rate below to work out their own duration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCovers 36 major, minor and trace elements\u003c\/strong\u003e across the four parts, matched to the ratio found in coral skeleton and tissue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with manual dosing or a Red Sea ReefDose\u003c\/strong\u003e for automated, split dosing through the day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairs with Red Sea's Reef Foundation and Coral Colours test kits\u003c\/strong\u003e so dosing is set from your own measured uptake, not a generic label rate.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eRED878\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarcode\u003c\/td\u003e\n\u003ctd\u003e7290116399034\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef volume\u003c\/td\u003e\n\u003ctd\u003eUp to 600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprox. duration\u003c\/td\u003e\n\u003ctd\u003e~3 months, mixed reef, dosed to programme\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParts included\u003c\/td\u003e\n\u003ctd\u003e4 — Ca\/Mg, Alkalinity, Iodine\/Potassium, Iron\/Bioactive Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater type\u003c\/td\u003e\n\u003ctd\u003eSaltwater (reef)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDosing method\u003c\/td\u003e\n\u003ctd\u003eManual or Red Sea ReefDose 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhich size do I need?\u003c\/h3\u003e\u003cp\u003eAll three RCP packs dose the same four elements in the same ratio — they differ only in reef volume and cost per 100 L over the roughly three-month cycle.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eReef volume\u003c\/th\u003e\n\u003cth\u003eApprox. cost per 100 L, per 3-month cycle\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmall\u003c\/td\u003e\n\u003ctd\u003eUp to 160 L\u003c\/td\u003e\n\u003ctd\u003e$68.13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedium\u003c\/td\u003e\n\u003ctd\u003eUp to 300 L\u003c\/td\u003e\n\u003ctd\u003e$63.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLarge\u003c\/td\u003e\n\u003ctd\u003eUp to 600 L\u003c\/td\u003e\n\u003ctd\u003e$49.83\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAt 600 L the Large pack is the best value per 100 L of the three sizes — worth buying up a size even if your reef is a little under 600 L, provided you'll use it within the ~3-month window.\u003c\/p\u003e\u003ch3\u003eDosing and elemental targets\u003c\/h3\u003e\u003cp\u003eFoundation elements (Parts 1 and 2) are formulated so 1 mL per 100 L raises calcium by 2 ppm, magnesium by roughly 1 ppm, and alkalinity by about 0.034 dKH — but the right daily dose is whatever your reef is actually consuming, not the label maximum.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eReef type\u003c\/th\u003e\n\u003cth\u003eTypical daily dose\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixed reef\u003c\/td\u003e\n\u003ctd\u003e~3 mL per 100 L, each part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPS-dominant\u003c\/td\u003e\n\u003ctd\u003e~4 mL per 100 L, each part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSPS frag \/ high growth\u003c\/td\u003e\n\u003ctd\u003e~6 mL per 100 L, each part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUltra-low-nutrient system\u003c\/td\u003e\n\u003ctd\u003e~2 mL per 100 L, each part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eNever exceed a daily increase of 20 ppm calcium, 0.5 meq\/L (1.4 dKH) alkalinity or 10 ppm magnesium — spread any larger correction over several days. When dosing manually, add magnesium first, then alkalinity, then calcium, with about 10 minutes between each. Part 4 (Iron \u0026amp; Bioactive Elements) has no single target ppm — Red Sea's guidance is to dose it in proportion to how much of Parts 1–3 your reef is using.\u003c\/p\u003e\u003ch3\u003eWhat's included \/ Not included\u003c\/h3\u003e\u003cp\u003eIncluded: four dosing solutions — Calcium \u0026amp; Magnesium+, Alkalinity\/KH \u0026amp; pH Stabiliser, Iodine \u0026amp; Potassium, and Iron \u0026amp; Bioactive Elements — proportioned for a 600 L reef over roughly three months.\u003c\/p\u003e\u003cp\u003eNot included: dosing pump, test kits, and the calcium\/alkalinity\/magnesium test results you'll need to set your own daily dose accurately. A Red Sea Reef Foundation test kit and either manual dosing or a ReefDose unit are what you'll still need to run the programme properly.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for established saltwater reef aquariums running coral, where calcium, alkalinity and magnesium need topping up against coral consumption.\u003c\/p\u003e\u003cp\u003eNot suitable for fish-only or newly cycled tanks with no coral demand — dosing without a measurable uptake risks pushing parameters too high. Not a substitute for water changes, and not intended for freshwater systems.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by the standard manufacturer guarantee against faulty product, in addition to your rights under Australian Consumer Law. Liquid reef additives ship as standard parcel freight from Brisbane; no special handling required for this pack size.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eDo I need a test kit to use this?\u003c\/h4\u003e\u003cp\u003eYou can dose to the tank-type guide above as a starting point, but Red Sea's own instructions recommend testing calcium, alkalinity and magnesium regularly and adjusting the dose to what your reef is actually using — dosing blind risks over- or under-shooting.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between the Small, Medium and Large packs?\u003c\/h4\u003e\u003cp\u003eThe same four elements in the same ratio — only the bottle sizes and the reef volume they're built for change. See the size comparison table above.\u003c\/p\u003e\u003ch4\u003eCan I dose all four parts at once?\u003c\/h4\u003e\u003cp\u003eRed Sea recommends spacing magnesium, alkalinity and calcium about 10 minutes apart when dosing manually, to avoid a local spike that can precipitate elements out of solution. The trace element part (Part 4) isn't time-sensitive in the same way.\u003c\/p\u003e\u003ch4\u003eWill this suit an SPS-dominant tank?\u003c\/h4\u003e\u003cp\u003eYes — SPS-dominant and frag systems typically consume more of each element, so they'll use the programme faster than the ~3-month mixed-reef estimate. Use the SPS dose rates above and expect to reorder sooner.\u003c\/p\u003e\u003ch4\u003eDoes this replace regular water changes?\u003c\/h4\u003e\u003cp\u003eNo. Dosing replaces what corals consume between water changes; it doesn't address the build-up of dissolved organics that water changes handle.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774162489635,"sku":"RED878","price":299.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/RedSeaCompleteReefCare.png?v=1782112700","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-reef-care-4-part-rcp-large-600ltr","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}