{"product_id":"red-sea-4-part-rcp","title":"Red Sea 4-Part RCP — Complete Reef Care for 150 L, 300 L and 600 L Reef Tanks","description":"\u003cp\u003eRed Sea's \u003cstrong\u003e4-Part RCP\u003c\/strong\u003e, also sold as \u003cem\u003eComplete Reef Care\u003c\/em\u003e, condenses a shelf of additives into four bottles. The 36 major, minor and trace elements a reef tank steadily uses up, alkalinity components included, are split across the four parts and pre-balanced in the ratio the reef consumes them. From there, a single weekly calcium test sets the dose for all four.\u003c\/p\u003e\n\n\u003cp\u003eRed Sea walks through the program:\u003c\/p\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/yvkGjXjtYZM\" title=\"Red Sea 4-part Complete Reef Care supplement program for reef tanks\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhat is in each of the four bottles\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePart 1\u003c\/strong\u003e: calcium, magnesium, strontium and barium\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePart 2\u003c\/strong\u003e: the KH \/ alkalinity components\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePart 3\u003c\/strong\u003e: potassium, boron and the halogens iodine, bromine and fluorine\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePart 4\u003c\/strong\u003e: iron, manganese, cobalt, copper, aluminum, zinc, chrome, nickel, plus 18 other bioactive trace elements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOne calcium test a week\u003c\/h2\u003e\n\u003cp\u003eThe four parts are dosed on a fixed ratio. Red Sea's own example: if Part 1, the one carrying calcium, is 5 ml, Part 2 will be 10 ml and Parts 3 and 4 will be 2.5 ml each. You set the recommended starting doses, then adjust them as calcium uptake shifts over the months.\u003c\/p\u003e\n\u003cp\u003eRun through a ReefDose 4, the whole program collapses into one setting: change the daily dose of Part 1 and the unit adjusts Parts 2, 3 and 4 on its own. The bottles are supplied in the same ratio they empty, so all four run out together.\u003c\/p\u003e\n\u003cp\u003eRed Sea shows the setup step by step:\u003c\/p\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/ExMSIqCTZYc\" title=\"How to set up the Red Sea 4-Part Program with ReefDose - reef tank dosing\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eThe Medium Pack at a glance\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt for a \u003cstrong\u003e300 L (80 gal)\u003c\/strong\u003e mixed reef\u003c\/li\u003e\n\u003cli\u003ePart 1: 1 L \u0026middot; Part 2: 2 L \u0026middot; Part 3: 0.5 L \u0026middot; Part 4: 0.5 L\u003c\/li\u003e\n\u003cli\u003eRed Sea puts the supply at roughly three months\u003c\/li\u003e\n\u003cli\u003eThe middle size: the Small Pack covers 150 L, the Large Pack 600 L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e4-part or 7-part?\u003c\/h2\u003e\n\u003cp\u003eThe 4-part program is designed for systems \u003cstrong\u003ewithout a refugium\u003c\/strong\u003e. In a tank with no refugium, coral growth is the dominant process driving water chemistry and the 36 elements deplete in a relatively fixed ratio, which is precisely what makes calcium-based dosing work. If your system runs a macroalgae refugium, Red Sea points you to the 7-part program instead (Reef Foundation and Trace Colors), where each element group is adjusted on its own.\u003c\/p\u003e\n\u003cp\u003eRed Sea compares the two programs here:\u003c\/p\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/7rvVZ9q9vfg\" title=\"Red Sea 4-part or 7-part supplement program - reef tank comparison\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eOur advice\u003c\/h2\u003e\n\u003cp\u003e\"I recommend the 4-part if you want great results while still enjoying the hobby: it is simple and it works. The 7-part, to me, is really for the person who wants to test everything and control everything. Personally, that is not my cup of tea.\"\u003c\/p\u003e\n\u003cp\u003e\"With a refugium, though, the 4-part does not work: the four parts stop being used up at the same rate, so it is no longer the one-test-for-everything method.\"\u003c\/p\u003e\n\u003cp\u003e\u0026mdash; Stéphane, Aquarium ReefSolution\u003c\/p\u003e\n\n\u003ch2\u003eThe Reef Care Program in full\u003c\/h2\u003e\n\u003cp\u003eThe 4-part is one branch of Red Sea's wider Reef Care Program. The first video introduces the program, the second covers the research behind the fixed ratio.\u003c\/p\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/zR0yIcFD7u8\" title=\"Red Sea Reef Care Program introduction - reef tank supplementation\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/fc4RppGepgI\" title=\"The science behind the Red Sea 4-Part supplement program for reef aquariums\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy buy it from ReefSolution\u003c\/h2\u003e\n\u003cp\u003eAquarium ReefSolution is an authorized Red Sea dealer. We ship across Canada, and if you are torn between pack sizes or between the two programs, our Laval store will walk you through it.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/red-sea-reefdose-doseurs-4-pompes\"\u003eReefDose 4\u003c\/a\u003e: the four-head doser that treats the program as a single product, Part 1 driving the other three.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/red-sea-coral-pro-salt\"\u003eCoral Pro Salt\u003c\/a\u003e: the starting point of the program, balanced seawater before any supplementation.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/red-sea-reef-energy-plus-500ml\"\u003eReef Energy Plus AB+\u003c\/a\u003e: coral nutrition, a separate job from mineral supplementation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIndependent review\u003c\/h2\u003e\n\u003cp\u003eAn independent hobbyist walkthrough of the whole Red Sea Reef Care line, useful if you are deciding between programs. It is not produced by Red Sea or by our store.\u003c\/p\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;margin:20px 0;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/hZklyH4WOcM\" title=\"Red Sea Reef Care Program explained - 4 part reef supplements\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eCan I dose on alkalinity instead of calcium?\u003c\/h3\u003e\n\u003cp\u003eRed Sea says no, and explains why: almost all the calcium is taken up by coral processes, while measured total alkalinity also includes borate, phosphate, fluoride, silicate, sulfate, nitrate and organic compounds, all affected by water changes, food and bacterial activity. Dosing all four parts off alkalinity builds up calcium and trace elements the corals never used.\u003c\/p\u003e\n\u003ch3\u003eI already run the 7-part program, can I move to the 4-part?\u003c\/h3\u003e\n\u003cp\u003eYes, if your system has no refugium: Red Sea describes the move from 7-part to 4-part as a straight switch. With a refugium, stay on the 7-part.\u003c\/p\u003e\n\u003ch3\u003eHow much do I dose to start?\u003c\/h3\u003e\n\u003cp\u003eRed Sea publishes an online tool, MyRecipe, that recommends starting doses for all four parts based on tank type, water volume and your goals. From there you adjust against your weekly calcium test.\u003c\/p\u003e","brand":"Red Sea","offers":[{"title":"Small (150 L)","offer_id":47580591915179,"sku":"RSR22751","price":101.99,"currency_code":"CAD","in_stock":true},{"title":"Medium (300 L)","offer_id":44604570861739,"sku":"RSR22753","price":166.99,"currency_code":"CAD","in_stock":true},{"title":"Large (600 L)","offer_id":47580591947947,"sku":"RSR22755","price":274.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/730773227532_jpg.png?v=1729048876","url":"https:\/\/reefsolution.com\/en\/products\/red-sea-4-part-rcp","provider":"Reef Solution","version":"1.0","type":"link"}