Rebuilding my 120 gallon. Have 3 bichir and 2 severum. The sevs are siblings and fight constantly. I separated the bully out to another tank. Wondering if they will work it out eventually or if I should rehome 1. If I rehome, what's a good tank mate for 1 sev and 3 bichir. Must be big enough to not get eaten but peaceful. Thanks!