I started off with a 10 gallon, and just recently got a 20 gallon. Already more work than i want to deal with right now haha. WELL I went and got 2 more from someone (they were FREE and both had filters...i can't pass up free lol) ones a 5 gallon and ones a 10. I'm not going to set it up and add fish because right now my 10 and 20 are enough. Any ideas what I could do with them? I want to keep them because eventually I will set it up for fish when I'm in a more permanent place, but for now any ideas?