Tidal waters glorified frag tank

[tidal_waters]

Okay here's the mystery whatchemacallit, and this would be the best pic i can get and unfortunately its a mug shot. The body seems to be translucent and I can't seem to see any distinguishing marks. The colony is doing well and growing, so its not chowing down on it. I'm thinking shrimp?





scratch the distinguishing marks comment, this other picture shows a little more of its claw