Coincidently I did the exact same thing today as well. But with bigger fish. I got my FH he’s around 4in and when I acclimated him and set him free in the tank all he’ll broke loose. I have a pair of convicts who are obviously breeding and have babies along with a 5in GT who is basically the boss and a female along with a jack, EBJ, salvini, and firemouth all of which range from 2.5-5in. All in a 125. Long story short he saw the babies went for them the parents defended the babies and the second the GT saw him he attacked and the convicts helped gang up on him. He got beat up pretty bad so I removed him to a secondary for now. I’m at a loss on how to approach the situation.