believ it or not one of my aros got eaten by either a 10inch bgk or ck about the same size aro was 5 inches....
so now i have aro comm tank and knife comm tank.. couldnt mix
i think it was a size thing. else they were roaming at night and one didnt like the aro in its wake.... i will try again maybe with jars. there not so much above targets i think.
not sure about the clown knife, but i have a BGK and a silver aro together........i dont think they even know the other is in the tank, well maybe at feeding time