well i finally folded under the pressure and scratched the idea of an african butterfly fish in a 15 gallon. instead i am getting a betta, 4-6 cories, 3-4 african dwarf frogs.. does this sound good? i am buying the betta tomorrow so what are some signs for a healthy betta since they dont swim around at the store. can i also add tetras or is that overstocked?? thanks