I had a clarkii & he was in my sebea he loved that thing, even fed it. Later I got a perc they got along just great for a long time & the clarkii, as strange as it may seam, was always trying to get the perc into the sebae. The perc had nothing to do with it but as time went on it got closer & closer to the sebae then one day he went in. A SHORT time later the clarkii got really agressive to the perc & I had to remove the clarkii, it got that bad that fast it was like overnight!!!! Found clarkii a good home & I still have my perc, sebae & added another perc. So I would strongly recomend against it. I know some will say it works, but sooner or later it will happen. I was lucky I seen it start & put a stop to it by removing one. If know one is around to see it start, it may get ugly in a hurry! Hope that helps.