You could do 10 if u had a Fx5 and a Uv filter.
I have 3 in my 180g with a stack of other ciclids
How big are the front's? I, personally, would get 20-30 @ 2"-3" for a 125gal with a good filtration system.

I'm running an Fx5 and have two Penguin 350's as backups, should I need them.
20-30!
Am I missing something here? Do they grow extreamly slowly or something?
I'm buying Blue Zaire Fronts at 1.5"-2"
Ah ok. Thanks for clearing that up. I guess I'll get alot and sell some off if/when that time comes.