get 3 ac110's. I run 2 on a 90 gallon overstocked with fish, and my water stays clear all the time. You won't regret it
vaine111;2948735; said:one other thing alot of people dont get the marineland 400's cause cost of the filters. i got a LFS that sells generic filters for them 4 for $10. but i just buy 12"x36" filter pad that cost $5 and cut it to size to fit in the 400's. and i get a pint size of carbon that i use in the refillable plastic sections that i barely use. still have some carbon that i have had for over a year now. thats about a years worth of filtration for me for $10.