If the FH is eating you can soak his food in Epson Salt and feed it to him for 5-10 days. But if your FH is not eating the best way to cure him of Hex is to use "Clear" and inject him a minimum of 5 times but as many as 10 times. The bottle of "Clear" comes with enough medicine to dose a FH at 6 inches or smaller 10 times. For larger FH you may need a second bottle. I just went through this with my Kamfa and Thai Silk. The Kamfa is back to himself after 5 days, but my Thai Silk is still sick so Im going to have to try to treat her for longer. Use Clear, it works.