Fish only you should look for 10x gph, reef your looking at 20 to 25x gph. I'll be running 4 MaxiJet 1200's at the first of the year on a wavemaker. I'm running 2 now with a Mag7 return pump and definatly need more flow with the amount of live rock in my tank. You can do a search for flow rates and everything I'm telling you will be here on this board.