I have a 3 inch dat that is ALWAYS out. He is my most active fish in my 180. Hes the only dat i have. i used to have three but one got ich and He killed the other. But i got a peacock feel about a month ago and everytime the feel comes out He picks on it and I'm not really sure why. I have other fish and He has never shown.any aggression towrds them. I guess it just gows to show all fish are different. Good luck