LyndaB: Sorry, forgot we were only talking about a 40g.
awilson133: I figured problems were probably likely with TB and any fish that is peaceful, slow, or has long fins.
fishyperson3010: Really it all depends. I think in a 40 you would be best to just have 1 school of fish. Maybe have something like 10-12 Tiger Barbs, 1 Centerpiece fish (will try to get some ideas), and some type of bottom dweller. I just can't see 2 different schools of fish, especially since we are talking about the fairly large Tiger Barbs. A single, larger group of schoolers is better than 2 smaller groups IMO.