Originally Posted by Saltfish
Hey guys I just got a new tank and i forget how many power heads i would need for a 75gal tank!! :help:
It depends on what you are going to keep. Fish only use a combined total gph turnover of about 75x15=1,125. If you plan on keeping corals then I believe it's atleast 75x20/25=1,500 to 1,875gph. Keep in mind that just because the filter or wet/dry or whatever says 1,200 doesn't really mean that. there are considerations to take like how high does it have to pump straight up etc.
HTH