A snail the size of a lemon, this Tiger Cowrie worked its way through my reef for more than a year. When I first set up my 29g reef, I kept buying these but they didn't live longer than a week. I did discover that they would consume an entire leaf of romaine lettuce within 30 minutes, as they are herbivores. Many years later with a much larger tank, I felt I'd try again. Since the water parameters were far more stable in that tank, and there was more surface area for it to snack upon, it did very well. It can fully retract the skin you see to reveal a beautiful glossy shell beneath. Other than being a bit of a bulldozer, I'd say it is Reef-safe.