This is my thirty gallon tropical tank. It's a little crowded at the moment, but that is offset somewhat by the magnum 350 with dual bio wheels and the meticulously maintained under gravel filter. I like to keep a canopy of floating plants in this tank as it subdues the lighting a bit and seems to put the fish more at ease. Due to the fact the pleco in the foreground is getting so big I will soon be getting at least a 75 gallon tank to replace this one.