Architectonica - Sundial Snail
A small snail who shell is shaped like a sundial with alternate black and white colors. A predator of Zoas and usually the first sign is that Zoas will start to be missing. Should be remove by hand when first seen and checked for eggs too. Comes in usually with colonies of Zoas and you should first do a dip in CoralRx before you place the Zoas into your tank. Also it good to take a turnkey baster and blow water over the Zoas, this will loosen any that maybe on or in the colony.