I have a 125 growout tank for 3 Pbass (all around 3") and 2 motoro rays (approx 4" disc). The filtration on the tank is a fluval FX5 stocked with Biomedia (potscrubbers and ceramic rings) as well as a ac110 with the standard rings/sponge combo. For this kind of a bioload with this filtration, I realize more is better however what do you think would be adequate. Would 2-3x a week at 34-40% be adequate?