i have noticed that one of my guppies has ick. hes the only one that has it, and his behavior isnt changed. im hoping to catch this before it goes too far. i turned the heat up to about 83, is this hot enough? also, if im putting aquarium salt in, how much should go in for a 10g? and should i pre mix it with some new water? or just add it to the tank? will more frequent water changes help? thanks every one in advance for answering these questions!