Just post here if you having/had a reefsafe fish/fishes that turns to non reefsafe.


I'll go first..

1.Used to have a blue hippo that one day started to take the liking in nipping at Brain coral.
2. Also had a common cleaner wrasse that cleans every fishes but like to attacks (not cleaning) Longhorn Cowfish (got a warning from another member,but did not beleive it til it happens).