is it a molt? is it a shrimp? no, it's...
This might be hard as I don't have a picture (digicam is already on order. I know I need it).
I just found this molt-looking, shrimp-like, transparent little thing floating just over the sandbed (it's actually crushed coral). I took it out. It looks like a molt, but it is so small it could even be the real thing.
It looks like some kind of shrimp; it has a set of four antennas, the longest of which is nearly as long as the whole body. Total lenght including antennas is about 1 centimetre (a bit less than 1/2"). It has 5 sets of visible legs, the biggest ones being at the center of the body.
I suspected it could be a mantis shrimp molt (assuming mantis shrimp DO molt... do they?), but it lacks the two large front claws which I suppose should be visible.
The body is thin and roundish, like a small tube. Different from a shrimp in that regard. It also seems to be lacking a head, meaning there's no part of the body which clearly looks like a head, as is the case with the blood shrimps I have in the tank.
Tank is 55g housing 4 fish, 2 blood shrimps, 4 turbo snails, 2 blue legged hermits. I have a large colony of copepods, but this is much larger than the biggest of them I have ever seen.
Finally, I have seen something very similar to this floating around just days ago; I assumed that was also a molt on the moment. It was eaten by a fish (well, more like tore apart as a matter of fact) before I could net it out.