yeah the temp and salt is the standard procedure, if it gets worse then you can try medicines, but you need to be careful as some fish are very sensitive
to medications, i had bad experiences with killing my own beloved fish......
but if the salt and temp did not work, and you are not sure if you want to take the risk of killing the fish, i've had success with curing ich with chinese
medicine, the benefits of that is it's dirt cheap, i think it only cost me 3 dollars to treat my 260g tank and it cured in 3 days, so there's no need to transfer
your fish to the Q tank. also it is impossible to overdoes. there's a recommand dosage, if you decided to go chinese i can check for you, but even a 6
times of recommand dosage wont kill your fish.
just aother safe and alternative way, pm me if you want to give it a try. one thing though, it ONLY works on ich.