Strange I have at least 5 RFA in the tank along with cleaner shrimp. Fire shrimp and peppermint but none of the bother my RFA s.Sorry to hear this, so frustrating. I bought my first rfa last spring, put it front and center on the rock. I was so pleased I was going to go back to my lfs and buy the other 4 they had. Then my skunk cleaner shrimp found it and began picking at it relentlessly. It moved a couple of inches the next day and again the shrimp was all over it and it stayed closed up like a ball. The fallowing day it wasn’t anywhere to be seen. The next day it was back and the shrimp was all over it. The next day gone and I never have seen it again. I really liked the colors. When the shrimp goes to a nursing home I hope to get a few and let them get established before adding another shrimp.