I read it a couple of places on a couple of different websites that ick parisites take longer to die in temps that are colder like 78 but if u raise they said that it helps move the process along in the death quicker also they mentioned using salt without iodine to help eleminate it too they had how many tablespoons per gallon I cant recall but by me changing the temp in one day I did show results but I also have been using garlic extract heavily during feeding too.