You can set it up with tank water (or matched to it), keep BB no LR. If you need to treat, then the LR becomes contaminated so shouldn't return to main tank when finished with the Q-tank. For hiding places use some pieces of PVC pipe.
Keep a eye on the others, no ich your lucky. If it's spread into the main, remove all to Q.
Might be worth a FW dip before placing in Q-tank.
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