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There are a lot of great ideas here. Just to add to what some people have said. An underground filter would be nice. Small tanks usually are more susceptible to disease because of their small nature. Remember not to feed the fish too much because the leftover food will turn to waste. A good idea is to get a couple of bottom feeders (i.e. Clown loach) Also, when cleaning your tank, if you use regular tap water to replace what you have taken out you will need to add a chlorine remover. Among other things, tap water has high concentrations of silica. This is what algae use to grow so you will probably want to add an algae eater. Lastly, put something in the tank that the fish can hide behind. Be it a rock or a plant, the fish will feel less stressed. When fish stress they become more susceptible to disease. Check out the links that were provided. Those are all great sites even though they primarily deal with marine and reef systems. The premise is the same for freshwater. Good luck with your system.
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