{"product_id":"red-sea-reef-care-4-part-rcp-small-160ltr","title":"Red Sea Reef Care 4 Part RCP Small 160ltr","description":"\u003cp\u003e\u003cstrong\u003eEven a 160 L reef needs calcium, alkalinity, magnesium and trace elements replaced on the same schedule as a larger tank.\u003c\/strong\u003e The Red Sea 4-Part RCP — Small pack — is the same four-part programme as the rest of the range, bottled for a mixed reef up to 160 L for roughly three months.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual or automated dosing\u003c\/strong\u003e — works by hand or through a Red Sea ReefDose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for reefs to 160 L\u003c\/strong\u003e — including nano and small reef tanks, built around roughly three months of daily dosing.\u003c\/li\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), bottled so all four run out together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36 major, minor and trace elements\u003c\/strong\u003e in the ratio found in coral skeleton and tissue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet your dose from testing\u003c\/strong\u003e, using a Red Sea Reef Foundation test kit, rather than the label rate alone.\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\u003eRED876\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarcode\u003c\/td\u003e\n\u003ctd\u003e7290116399058\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef volume\u003c\/td\u003e\n\u003ctd\u003eUp to 160 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\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\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedium\u003c\/td\u003e\n\u003ctd\u003eUp to 300 L\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\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eFor a 160 L reef dosed at the mixed-reef guide rate (~3 mL per 100 L per day), that's under 5 mL of each part daily — at the gentler ultra-low-nutrient rate, a nano reef well under 160 L will stretch the Small pack out past three months.\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 160 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 nano and small saltwater reef tanks from about 40–160 L running coral, where calcium, alkalinity and magnesium need topping up against 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; no special handling required for this pack size.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eIs this suitable for a nano reef under 100 L?\u003c\/h4\u003e\u003cp\u003eYes — the Small pack is sized for reefs up to 160 L, so a 40–100 L nano reef will get more than three months from it, particularly at the lower ultra-low-nutrient dose rate.\u003c\/p\u003e\u003ch4\u003eWhy buy the Small pack instead of splitting a Medium pack with another tank?\u003c\/h4\u003e\u003cp\u003eThe four bottles in every RCP pack are proportioned to finish together at that pack's rated volume — splitting a Medium pack across two smaller tanks works arithmetically, but you'd need to divide each of the four bottles accurately rather than dosing straight from the bottle.\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","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774162424099,"sku":"RED876","price":109.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-reef-care-4-part-rcp-43876700651811.webp?v=1790239294","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-reef-care-4-part-rcp-small-160ltr","provider":"Nicks AOT","version":"1.0","type":"link"}