Achilles in Qt for 30 days. 2 rounds of prazi. 2 doses of GC. 30 days of copper at 2.00 ppm. Food soaked with fenbendazole. No signs of ich or velvet. However he continues to occasionally scratch against the pvc. FW dip reveals no flukes. What now? Would you put him in the DT or treat again with prazi and GC. I know I always have the tough ones....