I've been trying to introduce these two clowns into my tank for several days. I've had them in and out 4 times in the past 2 weeks. I expected, to see some aggression from the Yellow Tail damsel, he usually will bully a newcomer for a short period then just seems to get over it pretty quickly. And that's what he has done now. But the Lawnmower Blenny goes ballistic on them!!. I thought they were "peaceful" . I've never seen any aggressive behavior from him before. I just got the acclimation box today , so we'll see how this goes. So far, it's been about 3 hours, the YT Damsel will make occasional passes at it but the blenny hasn't come out at all.