I've had these four ATF's since they were about 3-4 inches. Now they are about 5-7 inches, and one of them is showing territorial tendencies. The grow out tank size is 240gal, with some 7 whiteheadi. 4 coal grunters, and 4 widebar dats...first time I noticed it. One of the ATF is just chasing away a certain fish, and not all of them....anyone notice this behaviour?