It depends on the size of the fish more than anything, which i forgot to mention earlier. If the fish are small, the 170 gph will be fine. If they are larger (5+" IMO), I would say go with the AC 402 or something comparable. I would avoid the 802 for a 55, because the lowest setting on it doesnt seem to be all that "low" compared to when it is on full blast. I have an 802 in my 75 gal, and it does create quite a bit of current for a 4' tank.eL ChiNo LoCo said:I found one that was for a 30 gallon, but it had 170 gph, which I heard was a good setting, is it?
this will help you in the future. (just enter your dimensions):eL ChiNo LoCo said:-Whats a good GPH or whatever from a powerhead for a 55 gallon
-What does it run off?
-Do I need a bubble stone thing