rrkss said:2 teaspoons of tablesalt per gallon will take care of the ich but if you choose to go this route instead of the quickcure, add activated carbon to the filter and do a 50% waterchange first (carbon does not remove formalin).
I'll just quote myself again incase you did not read everything. Quickcure contains MG with will get removed by carbon and formalin which does not get removed by carbon. Formalin + Salt = fish death so a 50% waterchange is a must.