As of right now my 55 gallon has pool filter sand as a substrate. It's home to a large mouth bass and a pumpkinseed sunfish. I do have two plants that I managed to revive from my Oscar tank, I believe it's and Amazon sword and a Java fern but who knows. Anyway, I'm think about sucking out the sand and leaving it bare bottom. The only reason I'm suggesting this is because after a week or so of adding the bass I noticed that the amount of poo has reached an all time high. It just seems to me that it would be loads better to maintain water quality, than to try and replicate a "natural environment" for my fish. So I'm curious to see what everyone's opinion is about a bare bottom native tank.