Not sure what caused it or what if anything can be done... But one of my Zebra Bar Gobies has a pretty significant lower jaw injury. He was fine at the morning feeding, but I noticed it this afternoon. These guys dart into the rocks in a flash, so I suppose it could have been that this one zigged when he should have zagged. I'm fairly certain there is nothing in my tank that could have done this to him. I started the system up a year ago sterile. CUC is 100% snail, no hermits. All coral dipped prior to going in. And current stock is... Bellus Angel Swallowtail Angel Kole Tang Tenneti Tang 2 Occilaris Clowns 3 Flame Anthias 7 Zebra Bar Gobies In a 160 gallon DT I can't get close enough to get a picture much less get the poor guy out of the DT before he goes into the Rock hiding place. His lower jaw is ripped pretty bad, he can breathe but definitely looks lie he won't be able to eat. Any thoughts or suggestions?