i bought a cleaner shrimp 3 days ago, he seemed to settle in and he found his spot in the tank, but now i havent seen him for two days, could he be hiding for some reason or has something eaten him? his tank mates are a small clown, purple fire goby, 3 snails, blue legged hermit, red hermit, lawnmower blenny and 2 emerald crabs (and whatever other small creatures that live in the rock).