- Reaction score
Hello I have had 4 harlequins for a year now and they have been extremely peaceful in my Molly tank. I added some more so they have a total of 10 now to get a school going. Now 2 of the older ones are always chasing the others and fighting each other. I’m thinking it’s probably just trying to make there “pecking order” but it’s just confusing because I’ve never seen them do any kind of aggression at all.