Thanks for the help I think snorvich is right, my sand bed is about 2" and he's always under a rock but between him and my diamond goby they move the sand around too much. What's the best route to do to cure him? And what would cause brookelynellosis? My tank temp is high 70's, don't think it was dive bombing and it was always mostly under the rock with its head sticking out until recently it's been out and that's how I notice those markings