I have a 600 gal. talipia stock tank and plan on running 6 grow beds off of it, using the poly pools at Frys food store that are sold for $10 each. I have not stocked the tank with fish yet because I am in the filter build side now. I am trying to figure out if I need both a bio and a swirl filter or just one. I plan to fill the grow beds with crushed granite as my medium for the mineral contents…