I currently have a xp4 & 3 filter my tank which has 2 peacock bass 1 silver aro 1 tiger oscar 2 albino channel catfish 1 ck 1 softshell turtle 1 tsn 1 pleco. All fish range from 9inches to a foot. I no this tank is under filtered so my question is how effective would a sump strictly for bio teamed with a fx5 strictly for polishing and mechanical do for this tank thanks for the input all