I purchased a couple tiny damsels...a domino and a devil (blue devil or something like that). My other fish have been in the tank for almost a year (yellow tang, blue tang, two ocellaris clowns). All my current fish are way bigger than these two damsels. I was gonna put damsels in sump, but wondering if it would be ok to put them in DT since they are so small...could they really pick on the other, much larger, fish?