Doxycycline ( Antibiotic that kills bacteria living in parasites rendering parasites sterile). I bought it on the on-line auction site - Antibiotic for aquariums - use 100 mg twice a day. Avoid sunshine - makes skin super sensitive. Need minimum of 21 days; 6 wks ideal. Does NOT kill the parasitic things themselves but they cannot reproduce without this bacteria. Then go at them with the FenBen & Moxi. Slow and steady.