I am in the planing stage for converting my 55gal to keep a Bimac. I would appriciate any advice. This is what i am planning. 55 gal (tall) 35lb live rock 1" sand bed Over flow box with sponge per filter to sump into Skimmer (aquamedic turbo 1000) Wet dry tricle filter (any advice on amount of bio balls?) Canister filter for water polishing, vacume and mechanical filtration (mag 350) My big hang up rite now is what volume of bio balls would be recomended for this system to maintain an adult Bimac? Also, will using sponge pre filter from overflow box be sufficent for mechanical filtration prior to entering the Skimmer? Thanks for any advice.