One of my P taenitus species has developed a lesion at the base of the dorsal fin. The lesion is ulcerated and is not responding to conservative treatment, starting at salt baths, and antifungal/finrot medications. My question is should I use antibiotics on her, or should I continue to treat in conservative fashion. Also although she is moved to a hospital tank should I treat her old tank. Thanks for any help. Robert Molan rmolan@hunterlink.net.au