I believe having odd numbers is something to do with a pecking order of sorts, unless I'm remembering wrong.conniedavid1978 said:It really doesn't matter if you have an odd or even amount. Fish can't count. Lol. Glad to see with only four they aren't fighting. It seems that the more of them the less they fight so I would add 1-2 more. Later on I found adding the smaller females or baby girls the best. That way they don't fight with the leader. I have 1 male (bought as baby girl) and 11 girls together its funny how they interact.