I have a PB Tang in QT that just can't seem to shake Flukes. Last night was the 3rd time in 4 weeks that I've treated the tank with PraziPro. It always starts with him twitching, I treat with PraziPro and a couple of days later he's fine. About a week or so later he starts twitching again. I'm doing the treatments about every 2 weeks to kill the eggs. Should I be doing them more frequently?