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I have a 55 gallon standard tank..... about 100 lbs of live rock and was wonder how much water flow is needed to keep healthy sps corals. currently i have 2 maxi jet 1200's, 1 on each end of the tank.
Those maxijets output 295GPH. I wouldnt classify two as being fine for even a standard reef tank. If powerheads are going to be your only source of water flow then look for something larger like the Hagen 802 power heads.