I have ick in a 90 gallon planted tank the flagtail has ick what do i do the others in the tank are 3 peacock eels black ghost knife and a handful of guppies. I don't want to use the blue ick med. can i use salt. I have already bumped the heat up. (the flagtail is in a planted tank because a friend sold me all of his planted tank stuff for a deal i couldn't refuse)