So I set up a hospital tank a couple of months ago to treat for ich. I've removed all of my fish from my DT and transferred them to the hospital tank. I did however, set up the hospital tank with live sand and rock. Sand for my goby and rock for my fish to hide in. Been thinking of removing the rock and replacing it with a PVC pipe form. I'd really like for the tank to be bare with the exception of the PVC pipe and dumping the sand. Since the goby feeds from the sand, what do I do with him? More importantly, does he need to be treated since he is less susceptible to ich or can he withstand copper treatment?