Join Date: May 2011
Location: St. Louis, MO, USA
Very hard to figure out from the pic, but I would lean toward parasite and quarantine the shrimp. Definitely not a broken blood vessel. It looks like some sort of foreign body to me. If you are going to just get rid of it, I would be interested in dissecting it under a stereoscope and trying to see what it is. PM me know if you want me to give it a shot.