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Sometimes I remove them just for the sake of trying to dry it out and preserve it. Other times I'll leave it in there for customers and their kids to see. I have an 18 gallon reef that's been going for over three years successfully. It's on the front counter where the register is at which is in front of the store's front door. Everyone coming in and leaving sees this tank. I also have a 29 gallon at home. Again, I only take out the shedded shell if I want to try drying it out to preserve it. Otherwise...it stays in the tank and becomes part of the sandbed if not utilized by a critter.