idk if salt helps with gill curl... i know it helps with alot of sickness'...i have used table salt for ick and i am now useing it for a fungus...put the temp to like 84f...add 1 tablespoon for every 5 gal make sure the salt is disolved first and add it slowly...people say table salt is not good but, lupin said it doesn't matter in the sick forum...i used it with tsns and aros and no issuses so there it is...