I would add him in when adding all the other fish back in. That way the aggressiveness is spread outthank you all, good to know this is common! How long shall I keep him in the sump? I know there are no guarantees if he will behave after adding him back, but I love this health convict and would like to give him a 2nd chance, specially coz he was doing pretty well during his 1st 50 days with the same set of fish! I am thinking maybe keep him in there until the end of hypo (about a month from now)?
