Personally I hate meds. That being said, my new arrivals are fed frozen foods fortified with vitamin c, hufa's and garlic. If new arrivals do not feed, no matter what meds are used, it's going to die anyway.
I'm not saying I won't use meds but I do my best not to. To control ich, I have used hypo salinity and or 82F. I prefer a holistic approach.
Jim
For your QT, I recommend more flow, possibly salinity od 1.020 and a temp of 80, with frequent fortified feedings.
A hungry fish is a weak and vulnerable fish...prime for problems