Hi Dustin,

Sorry about your Domino. I had a similar experience with one from Petco, so that might be part of it. Shock is a big factor. They don't acclimate them as well as they should when they get them in and generally scare them nearly to death when they net them for a customer. Parasites on the gills could cause the fish to rub the rocks like that. Might have just been an unhealthy fish.

-Ed