Thats tight that your gonna set up a fish room. I think that you should have just one big w/d filter for each tank instead of two fx5. It would cost about the same, just the difference is it would be alot easier to maintain and you would get better water circulation, just get a strong GPH pump, and for a UV. Although I myself have the fx5 filtering a 240gal tank,5 fish, and bare bottom, I know it would be alot easier to maintain a W/D. I have to keep my water about 2 to 3 inches below the top of the tank to get water circulation. Before when I didnt my ammonia, nitrite and nitrate spiked up. Although I had 9 different fishes, rtc 13in, sailfin cat 17in, 2 pbass 10in, 1ft, african tiger pike 1ft, hero sevrum 8in, dovii 8in, marble cat 1ft, greenpike 1ft. So if it was up to me I would get a W/D since your looking in to getting ]V[onster fishes..