I have a tank with 4 neon tetras...1 cory catfish...2 gold fish and an alge sucker (don't remember what kind). I recently bought a small cichlid and introduced him to the gang. I put a nice rock/tunnel thing in the tank for him to hide in. So far he has not been a problem. Do you think he'll stay dossile? Or do you think he may become a problem. Thanks for your input.