I have a 55 gallon aquarium with 5 Glolight Tetras, 2 Black Neon Tetras, 3 Rummynose tetras, 2 Blue Rams, and 2 Pictus Cats. I plan on adding 2 or 3 more black neons and 6 or 7 more rummynose so they'll all be able to have a little school of their own. This is probably a stupid and pointless question, but why do all of my fish swim near the bottom of the tank? I had 5 buenos aries tetras in there before I moved them and put in the glolights and black neons, and they stayed within an inch or two of the bottom almost all of the time too. I have fake plants in my aquarium, but made sure there were tall ones so that the fish could feel secure at any level. I also made sure I planted them far enough apart so the fish could maneuver through them without hurting their fins, since I read plastic plants could be hard on fins. However, I would say that 3/4 of the tank is semi-densely "planted." I don't think that the fish are staying on the bottom because of any issues with water quality or whatever, it's just kind of annoying that 3/4 of my tank doesn't have anything swimming in it most of the time. Any suggestions?