QT question

[Baldy]

Hey all,

Not sure if i should even really be asking this but here goes.

Ive got a 75g reef tank thats got ich. i added a kole tang as well as a solar fairy wrasse lately. everything was ok until the kole had an outbreak. it went through the first cycle and dropped off the fish entirely. i pretty much knew that it was going to come back in a week or so, and now here i am, and its coming back.

I have a large kole tang, medium foxface, flame hawkfish, 2 clowns, solar fairy wrasse, and matted filefish. and i only have a 29g QT.

should i risk 8 weeks with all fish in QT, or try letting the ich run its course? i dont have the ability to set up a larger QT atm unfortunately.