For a long time I had a group of tiger barbs in with my mbuna. 75 gallon tank, If I remember right it was 6 black phase Acei, 6 yellow labs, 4 red zebras, 4 Pseudotropheous Scolofi. There were at least 12 tiger barbs. I only lost 1 fish in that tank in the year it was set up with the tiger barbs.