This is what I think I might do, is cut a piece of acrylic to fit snuggly in the filter slot, drill a bunch of holes in the bottom(of the acrylic),put some ceramic rings in the bottom in front of the acrylic, some filter floss on top and then a course sponge on top of that behind the grates. And then on the other side put some ehiem bio balls then put some purigen on top of that.
Heres a rough sketch:
Last edited by DoubleT; 10-26-2012 at 05:06 PM.
Reason: add picture