I used a 36x20x56 inch tent i got off amazon a year ago. It was only 70$!
Also the dry ice hash, this is what i followed, http://www.youtube.com/watch?v=1buSgDNfGFQ
I expect a 10-15 gram loss still in weight throughout the entire crop.
Yes it seemed shocking to me aswell because ive grown outside before but I have 4 hydrometers and they are all at 68-70% humidity if jared (i tested it out with a sample jar for each).