ya as hao said temp. and salt...i have head table salt works well and i am tring it know...1 tablespoon per 5gal...iodine DOESN'T make a diff. i got the info from lupin in the sick forum..
I would REALLY advise against table salt, use kosher salt, then raise temp like Hao said. Do a few more water changes and make sure the water is clean, then all should be good.