DONT PUT ANY MEDICINE IN YOUR TANK.
If its a medication that actually works,it'll kill your live rock and inverts.Plus if its one that says reef safe,then its not worth the money you'll pay for it.
Just QT the Kole and treat him.Maybe he'll fight it off.But I highly doubt it in a 10 gallon tank.Koles need a lot more room than that size tank will give him,so he's going to be stressed to hell and back.