I've got a 200 gallon tank I keep goldfish and sunfish in to use for catfish bait. I've got two aquarium pumps in it that each have 2 air stones on them. Fish sometimes start to die on me and I dont know if its from ammonia or what in the water. Already use Better Bait and keep aquarium salt in the water, but was wondering should I get some kind of filter systems for it? Am fixing to order some of the U2 pro formula and try that. Does anybody have any suggestions on what they got they made? I dont think the ones you can buy for aquariums are big enough to work because I normally keep about 150 gallons of water in it. Anybody got any pics? Thanks in advance.