probably won't do a thing for ick, except increase the water quality(by removing excess nutrients) , thus reducing the stress on the fish, thus reducing the chances(some, but not 100% by far)
do you have a hospital tank??
if not, i would reccommend one
also, kyolic garlic, can get it at gnc, will help in the prevention of ick, and MAY help with really minor cases, just add it to their food every 10 to 14 days