Yeah I'm going to follow up with the LFS about how he turns out, hopefully it wasn't anything pathogenic.That's not going to help your tank, though, as removing the fish doesn't remove the risk to your tank. If you've introduced a pathogen into your build you're going to have to consider treating it, or run the risk of infecting any other fish that you put into it. You may have to go fallow if you diagnose a treatable disease or parasititc infection.