Just a suggestion for those who are using oversized 16x20 trays for 8x20 or 7x17 film developing... I just found 11x22" trays that work perfectly. They're 2 1/2" deep and grooved along the bottom for easily picking up the slippery negs. Used them for the first time last night and they worked great!
I found them at www.buyplantlights.com. They are Perma-nest trays, model GT2211-6. They come 6 for $44.95. You can order clear lids also if you like. I'm sure there are other dealers out there too.