Well I don't know how, but I have lost 3 cleaner shrimp in 4 days. Only thing that comes to mind is seeing my Possum wrasse getting rather aggressive. After loosing the second one I could almost see him taunting the 3rd one. I never witnessed the murder and didn't think a wrasse would go for cleaner shrimp, is this possible? If it is, I guess I am going to have to make another place regarding clean up crew.