Sorry if this has been answered. Picked up one from someone tearing down their tank. Was a good eater in his tank but had some fin damage, which looks like a bacterial infection. Put him in a 20 gallon qt tank with some large rocks for hiding places. He is in qt day 2 now and shows no activity and won't go after any food. Started treating with maracyn 2 yesterday and will pick up some blackworms or live brine to try to tempt him/her to eat. Any other suggestions. Refused PE mysis (previous diet) as well as pellets and squid.