The jack dempsey is still in my son's 29-gallon tank. He decided to keep him. He wants to start a salt water tank and has been doing a lot of research on it (we got him another 29-gallon tank for his 16th b-day which is in 2 weeks). Believe me, I thought about putting that nasty african cichlid in with the jack dempsey but I just don't have the heart to do it. The JD would have it for lunch. If it keeps up the aggressiveness, I'll have to put it in another tank by itself. The problem is, we're running out of room to put fish tanks!