So for about 8 months my cleaner shrimp has been hosting/hiding under my ritteri nem. It's funny to me cause this nem has a super aggressive sting and is sticky as hell. Last Christmas I thought I might have had to go to the hospital when the rit wrapped around my forearm and stung the hell of of me. But that cleaner is not effected by the rit. I also feed the ritteri krill so wth. Owell thought it was funny how the shrimp uses the Ritteri for protection.