Need Help to identify this critter and clown?

[vertex]

#1. Anyone know what this is? Its about 3/4 inch long, has a tiny flat hard shell on top of its back it looks and moves fast, maybe a nudibranch or snail? Any ideas? Came on a small piece of live rock, should I leave it in the tank or could it be harmful?



#2. Also, I bought a clown that was sold as a maroon clown and is the color of a maroon but the shape and stripes are identical to a percula. Two pics below show different lighting so the color is hopefully more obvious. My books show the maroon stripes and head shape slightly different than a percula, anyone here know which this is for sure?

[Tarolisol]

Looks like a maroon clown to me, plus if it took to that anemone that well it most likly not percula as they can be quite fussy when it comes to hosting in a BTA, Mine have a rbta and a gbta to choose from and still they choose the flowerpot coral. The first pick might be a limpet (sp?) of some sorts.

[SeaHorse_Fanatic]

#1. It's a type of snail. I have it also. Check other threads because someone posted a link that gives specific information about or look Google under Stomatella snails. I believe it is generally a harmless algae eater/scavenger.

#2. Looks like a maroon, but to be sure, look for spines on the cheeks. Maroons are the only clowns with these distinctive spines. The images don't give a clear side view of the fish for positive ID so you'll have to look for the spines.

Anthony

[vertex]

OK thanks both of you. That helps a lot. I think it (the clown) has these spines when I look closely, must be a maroon then and since it took to the rbta immdediately. Thanks for the help and quick reply!

[albert_dao]

The snail is called Stomatella. They are awesome algae grazers that maybe or may not establish reproducing populations in your tank.

Edit: Oops, Seahorse beat me to it.

[Tarolisol]

And i was just wrong about the snail