I had an ich outbreak which killed off all my fish, but 1 damsel. I set up a QT tank and now have a question. Will the ich die off in my main tank after a month?
If you have NO fish in your main tank the ich will die around 30days because they have no host to attach to.
Upper right hand corner of the BB you'll see "search". Click it and type in "ich" you will see pages of other peoples questions on this subject. It is VERY helpful. I'm currently running hyposalinity for my ich outbreak.
Good luck!