JohnK, look's like a great little set-up you have, those bio-balls should work well, I have a bubble bead filter which is similar in operation to your filter, the 100gal tank has 10 large PS's and 1 big GSH who are fed heavily and my ammonia and nitrites are zero.
I imagine some bog plants would be nice in the filter if they get enough light.
What type forage are you gonna put into the tanks and what is the GPH of the return pump your using? Also have you checked the ammonia & nitrites with a test kit?
