At this point I would have to recommend for him to stop. There is way too many people telling him what to do with a fish that from what I can tell (eating is an excellent sign it is healthy for now) is healthy. A fish does not needs baths and dips and emergency qts at this point. He's going to stress and potentially kill his second fish, why, because it flashed, because it was with a fish that was diagnosed with velvet via the Internet? Now we have the owner panicked, buying anything and everything to save his fish and almost none of it is stuff we'd use on our own fish. My advise, stop now, return anything unopened that is not prazi or copper, cycle the tank with tims, and observe your fish. If he's eating mysis shrimp daily he should be fine long enough to qt.