It sure looks like there could be Dyno's on the sand, hard to tell from the pic. Bristletooth tangs are constant peckers eating all day. If, and big IF here, if those are Dyno's and the fish ate enough of them it could kill it. It's just too hard to say at this point and trying to figure it out isn't going to do any good unless the other fish are showing symptoms.
It's really hard to figure out these type of problems with a limited amount of data to go off of. We don't know the history of the system, like how old it is, and with partially answered questions it gets kinda frustrating for us as much as it is for the person that lost an animal. I can say most of us here hate to see someone lose any livestock.
What is dyno and can I get rid of it?
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