Bite from something in tank

[batmanrob]

moving my whole setup. Putting in the last piece of live rock. Feel this prick on my hand. Pull hand out. Small little prick, looks to be a short whitish hair. I pull it out.
Half an hour later still feel a lot of pain. Bruising about size of a half a dime. Finger is all swollen up. Burning pain.

So any idea what it could be?
The rock might of had a Bristol starfish under it. Hard to say now.

Other than that my tank has blue tang, yellow tang and lawnmower blenny.