Salt is another effective treatment.
By raising salt levels to 2-3 ppm or 1.002-1.003 specific gravity above what one normally keeps the tank at can destroy the Ich parasites. It has a strong effect on osmosis, and dehydrates the parasite to the point the parasite can no longer function and dies. Again, raising levels slowly but not too slowly is key here; raising salt 1 ppm per day is recommended. Generally 7.6 grams of salt per gallon is equal to 2 ppm or 1.002-1.003 specific gravity . However, it?s the chloride ions which are necessary for the treatment, and different salts have different levels of chloride. It?s best to purchase a hydrometer which measures low levels of salt to ensure proper dosage.
2 weeks at those levels sure eradicate all the parasites. Again, be sure all the fish in your tank can deal with those levels of salt. On that note, most scaleless fish CAN handle these levels of salt. Plecos and loaches especially do fine despite internet rumors to the contrary. It has been noted some tetras and corys do not do well with salt, however.
