My clown loaches have been developing white spots on their fins and body but my other fish aren’t showing signs of this. I assume that I have an ich outbreak. Does that mean my whole tank is infected? My tank consists of silver dollars, bichirs, bristlenose pleco, bala sharks, and ropefish. Are the bichirs, ropefish, and pleco okay with salt in the tank and how much of it? What kind of brand of salt should I use and what directions are needed to cure ich?