While Lion has more experience than I (by far). If you have some experience in the hobby, a cycled QT, and a good refractometer, you could also consider
hyposalinity on the LMB while he is in the QT.
Ich appears to be the scourge of this hobby and hyposalinity offers the safest (best?) form of prevention and treatment.
But if you QT only you are still way ahead of many other swf enthusiasts