Purple Chitons!?

[JordanM]

Has anyone ever saw purple chitons before? There are some that are white and some that are purple. Could this come from some of them eating the coraline algae? I also wanted to know everyones thoughts on if I should add these two my new setup of the 120 gallon tank. I like coraline algae but im guessing these little chitons wont be able to put to big of a dent in eating coraline, but it does not look like there doing a very good job clearing off the little bit of surface algae growing on this rock. I just dont want to introduce a pest to the new tank that i will regret further down the road. The 120 gallon is a bare bottom and I plan on using cerith snails and maybe an emerald crab.

 

[Kamden Uelton]

Chitons come in many colors, These look like Purple Chitons. They are peaceful algae eaters that will ONLY eat algae and nothing else.

EDIT : actually some species are known to eat sponge.