Ok, so I am starting to do some research on what to put in my son's 5 gallon tank once it is cycled, and I had originally wanted to get some glo-fish to put in there, but have finally accepted that it is just too small for them. I would still like to get some eventually, but am baffled on what size tank they would need. My LFS said a 5 gallon was fine, I have read here that it is not nearly long enough for them. I read here that a 10 would work, but then I just read that it is again not nearly long enough for them. What is the minimum size tank they need in order to be happy?