I purchased a one gallon aquarium for my daughter. We have 4 platies, 3 neon tetras, 3 glowlight tetras, 1 tetra a little bigger than the neon tetra with a blue line on it, a small catfish like fish about the same size as the tetras, and a pretty big apple snail. After reading much about care etc., I have come to the conclusion that I may have too many fish for this one gallon aquarium. I have the option of getting another one or two gallon aquarium, but I still don't know how I should split them up. Can one of you guys give me a recommendation? Also, I am paraniod that the tetras may have neon tetra disease because I saw a small white spot on one of the glowlight tetras.