What's the largest single fish I could stick in a 29 gal that is in the cichlidae family???? I have heard of ppl getting oscars for this size of tank. Is growth stuntig actually harmful??? Please let me know!! Reason why I am asking is because my firemouths won;t leave each other alone and I am afraid I'll lose them both. Believe me, I have hinding places galore!!! Again, thanks!!