I have a planted 20 gallon with 6 guppies and 3 cory catfish. I was wondering what other types of fish would be an option to put in this tank. I have tried keeping the babies frow the guppies to fill it out a little, but they all get eaten one way or another, now I pretty much gave up. As of next week, I am only going to have 3 guppies in the tank, because I promised a few to a friend of mine. But I have no idea what I even want in this tank, so any suggestions would be great.