Cerith snails (Cerithithium sp.) are easy to care for scavengers who eat diatoms and algae. They are an excellent addition to a reef aquarium, easy to care for and beneficial. They can grow up to 6 inches, though I personally have never seen one that large.

Some varieties of these snails need to go above the water line from time to time...

The picture below is of a Cerith laying eggs on the glass of my refugium.

beautiful thats a momment you rarely seee nice picture

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Thanks Joey, wish I had cleaned the outside glass first!

Another great Pic and write up marlenez!

These are excellent guys to have in the tank. I try to add a few of these to every tank I have, especially to smaller tanks. They make a great addition to any well balanced clean up crew!

Awesome picture, thanks for sharing. An excellent member of the clean-up-crew, as mentioned.
Just how many types of Ceriths are there?

The two most common that I know about are Cerithium litertatum and Cerithium altratum. I believe the latter is a 100% herbivore.