Well, I have not ventured into the larger fish...
But as I have said before, my keyholes are adorable little guys. Mad, but adorable.
I took them back to the LFS a little while ago on account of the madness which was brought on by bubbles. Don't ask me what about bubbles, I just don't know.
I missed them though, so got a much bigger tank and put everything in there and got my keyhoels back. People at the fish store though I was barmy - then again, I have bought the fish from them twice now!
They are still mad, but do seem to have calmed down. The other fish have plenty of space to move away from them when they are moody.
Although, I think they hate me for taking them back to the LFS for a couple of weeks.