Hypo definitely does work. I have used it many, many times in my QT with 100% success rate. The key is to take it down to 1.009 and keep it there for at least 4 weeks. Also you need an ongoing QT set up ready to go with a canister filter (or similar sponge filter) to ensure you have a mature nitrogen cycle. Otherwise you will be battling ammonia and pH swings, and mostly likely not successful. It is not something you can set up and use at the last minute.
The biggest downside to hypo is that it is a lengthy process. The total process usually takes 2 to 3 months for me (taking it down and then slowly bringing it back up again). I also do a Prazipro treatment in QT.
But the important thing is to use QT as a preventative with all new fish. Pretty hard to catch your fish in the DT, and they will indeed be highly stressed with a move at that time. Plus your DT is now infected anyway, and likely more fish will get ich.
Another method (besides copper which I don't like) that I have heard works well, is the tank transfer method. Only takes 9 days to complete. Might try that myself one of these times instead of hypo.
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