Sue's excellent article came out about the same time I was experimenting with starting my ISOs out drier to match the poor petstore conditions. I'd noticed several years ago that my crabs would get PPS when I subjected them directly to high humidity, even though that's supposed to be their ideal environment. Sue's articles were quite timely and extremely informative and helpful, and helped me shape my own ISO method. I recently wrote up a simple 1-page document on ISOing new crabs and avoiding PPS, which is just a description of my method of ISOing, which has worked quite well for me in the last couple of years. The coenobita research articles are more in-depth, detailed, and complete. But I thought new members might find my article useful. http://www.jedimasterthrash.com/crabbies/PostPurchaseSyndrome.doc