Well that was disappointing, our shrimp was not molting he was fading.... Apparently I dipped our new coral to add to our tank one piece being an encrusted rock. I thoroughly rinsed the coral before putting it in the tank but did not consider the porous rock as i rinised the surface. The rock must have taken some of the dip in the tank with it and the shrimp paid the price for my mistake. Everyone else seems fine and happy. I broke the news to my students this morning. Although we are all a bit saddened we are developing a step by step procedure for adding things to the tank to ensure this never happens again. we are also adding a bag of charcoal to the filtration to help remove any residual chemicals in tank and doing a water change today, and again in about 3 days before adding a new shrimp. Question how will water change this soon after being added affect the corals added saturday and yesterday.