I only have a clean up crew in my tank right now which included a sea slug(he did a great job on some hair algea I had) sincce yesterday I havn't been able to find my slug. Is it possible something I have ate him? I have a brittle star,pepermint shrimp, porceline crab and a sea urchin, can any of these things have eaten the slug? and if not what do you think happened to him?