Herbtana is a unique, herbal, immune enhancing stimulant which expels most parasites before serious problems develop. Salt & Fresh & Reef Safe. Herbtana is a natural, chemical free treatment effective against parasites including: White Spot (Ich), Flukes (gill and skin), Chilodonella, Costia, Oodinium, and Trichodina. For best results, start using the product as soon as symptoms appear.