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I have a 75 gallon saltwater tank fish only with about 60 lbs of rock and 40+ pounds of sand. Its been running for almost a year. Now I want to make it a reef tank I have most of the equipment I just want to make sure I'm not missing anything. I have a canister filter rated for a 125 I clean it every other day, protien skimmer, 2 coral lights for got the name, 2 800 gph power heads and 2 250watt heaters. I have both test kits now. Anything else I need like tank addatives like calcium? I only have 3 fish so the tank is very clean since there so small for the tank.