I have this HUGE 500 gallon aquarium. Its been cycling for roughly 2 years now and I'm pretty sure its ready for a fish. I got one neon tetra in there right now and I was wondering... Do I have room for 1 more?
I think you should take the tetra back. It gets way too big for your tank. And should be kept in a group of three to six at least. Did the guy at PetSmart tell you it was ok to stick him in that small of tank? Perhaps you should replace him with an endler.