I have a planted 30 that currently has a school of five zebra danios and a group of five cories. I want a more vibrant fish, but not a gourami or betta. I was wondering if I could do a single firemouth or maybe a few shellies. I don't want the cories to get picked on, that is my main concern. Are male FM's terribly nasty when they are kept be themselves? Do they need to be with others? I do not want more than one Firemouth, so if they need to be with others then it is out of the question; same goes if it would grow too large for a 30g. Do they get 6" or 4"? My pet store states 4", but online I saw 6".
I trust the forums here over any of the online/LFS sources.
Any advice?
Any advice?