You almost sound like people here are hoping your fish don't make it and/or that we want to see you fail. I will speak for myself, but bet that most here would agree...the reason I take so much time daily/weekly to respond to posts on this board is that I've been doing this for a while. I've learned a thing or two and if I can help out, I do my best to. I will not, however, keep quiet when people ask for advice and then don't listen. Ill try to point out why its a bad idea and if people continue to ignore solid advice, I stop and let them learn the hard way.
For QT, yes, your fish are going to be stressed. By definition, your are either using copper, which is basically a poison to them or you are putting them in less than ideal salinity. Both are effective though. Is putting your fish back in DT prior to a month ideal? No. Does it mean there is still Ich in there,? Odds are yes. Is that the end of the world? Probably not. Some people choose to not treat Ich in QT and hope that keeping pristine water conditions and fish well-fed will work. Sometimes it does., sometimes not.
Since the fish are back in, try to maintain pristine parameters. Keep an eye on them, as you are adding a bunch of fish to a system that probably lost some BB over the course of 25 days.
I'm rooting for you and all of your fish...keep us updated...