I don't dose iodine at all. Should be taken care of through normal water changes. My CBS has been in my tank for almost a year.
I thought that sometime shrimps can molt more often it water quality or health is not up to snuff. I don't think mine molts that aften but I don't always see it. When mine lost an arm, he molted twice in a month to re-grow his arm back. Looks normal now
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,