I have a solo pair of brichardi in my 90 gallon Lake Tang with Altolamp calvus and comps; plenty of rockwork. So far, so good and I have not had any problems; some short chases but nothing serious. In fact, the zebra calvus are the most aggressive specimens in the tank (go figure). However, I have heard of the scenario described above; brichardi pair breeds and then all hell breaks loose. I have a feeling I have a non-breeding pair, but we'll see.