I was glued to my tank today and spotted this little guy. Approx 1/4 inch in length, maybe... moves very quickly. Spotted first on the sand bed and then moved to the glass. We have a tank that has only been up and running for approx 2 months with little life other than some janitors and a cabbage coral from a friend. We seeded with GARF grunge. There is a small shell presence and long tentacles. Turbo! What to do with it??? Thanks!