I use a 4" piece of coarse poret foam, a 2" piece of med poret foam then a 2" piece of fine poret foam. That's it.
This is for my 75 gallon with 8 hatchetfish, 6 nearly adult angels, 8 cory and a whole slew of rcs that breed in the sump itself. I have had this sump running for several months and I rinsed the fine sheet of foam once when I was overfeeding.
I use a mag 5 for a return pump. I used a 9.5 for a while and thought about going back to it BUT if the flow is too fast then the 'stuff' breaks away from the media and ends up back in the tank.
-I think if you have tone down the flow of water through the filter media you will find you don't need to use floss or a filter sock.
If I was to do it again I would use the exact same setup but switch the medium and fine pieces to 4".
Last edited by dprais1; 12-05-2012 at 11:46 PM.