Last night I cleaned my tank: scraped the walls, removed detritus, cleaned filter, cleaned hood, removed salt creep & did water change. All in all took about an hour. I reassemble the tank, turned the lights back on & low & behold my peppermint shrimp was in the process of molting. It just figured- he had to wait until I was done, I left the molt in the tank, I'll get it today.
I watched him for a while, it was cool how his exoskeleton peeled away, he did a little wriggling and swimming around to free himself. Wish I had that digicam!