Hey Dave, welcome to AA. Sorry to say, but I've never heard of a sand enomone. Perhaps you are referring to rock anemones? If so, the most likely issue is lighting, color loss could be due to too little or too much. What type of lighting are you running and what size tank?
"Listen to some of these guys talk, and it's like they were born from their momma's belly with a fishkeeping encyclopedia in one hand and an API kit in the other" (unrevealed).