Potts050;2564830; said:The FX5 is the better choice of the two you mention. You should look at an XP4 as well. I'm running a 400 gallon system on an XP3 with no worries and 30 plus fish average length 4''.
I have a cascade 1500 on a 49g bow front, along with the Bio-wheel marineland that came with the tank.Golden Pygo;2564929; said:I ordered the cascade 1500. That means that I will have an AC110 and Cascade1500 on my 100gal with 6 pygos.