I don't know if you can purchase the SERA products in the USA. They also have a booklet which describes the different illnesses a fish might experience and what to use to treat. Some reasons for most fish getting sick is water quality and stress. Stress can be caused by a number of reasons, with one being having moved them. I would suggest you try adding some salt as most of the bugs can't withstand the change in salinity due to their simple structure. Before treating you need to do a water change. It is good that this fish still has its appetite. Let us know what transpires. Good kuck.