Just got a ARTC about 5 inches this Friday. He is currently in my 240 gallon tank with a 10 inch CK and a 8 inch Aro. I made a small cave for him so that the CK wont eat him-seems to be working. I feed him shrimp and tilapia using tongs to bring the food to his cave-so he wont have to come out. Question is when he gets big will he kill his mates. Ive heard they are really aggressive-but I have seen ARTC with tank mates such as the ones I have him with?