I have successfully cycled a 5 gallon tank with 4 neon tetras, one small orange fish (forgot the name) and one bottom feeder (again, forgot the name) They have been living happily together for 3 months now. I am hooked on the hobby and want to upgrade to a 10 gallon. I will give my DD the 5 gallon as she only has a 1 gallon now with a couple of tetras in it. I want to move my fish into the 10 gallon and add something else that is fun and friendly, but won't get too big as I have learned my lesson on overstocking while cycling. The orange fish I have can get a tiny bit nippy. He is a platie of some sort. Any ideas?