I have a 20 gallon, and all I have in there at the moment is one neon tetra, & a black stripe tetra ( I think what it's called?... It's a pale red tetra with a black stripe, and red fins. ) The rest of the tankmates were killed off by ick, and I couldn't stop it until after they all died. :l And yes, I understand that they're schooling fish. But, I've been nagging myself to add live plants, so I'm going to start with my 10 gallon and add some easy plants, but I'm not sure if it's the best idea. I was planning on adding 2 mystery snails, a pleco, whatever shrimp I can find at my store, and 6 or 7 neon tetras, and maybe 5 guppies. But, I was thinking what plants would be best for the tank, and whether not I should add a 10 gallon filter, a 15 gal filter, or a 20 gal filter, or no filter at all.