Can someone I.D. This slug?

[Daviddes]

Just started setting up my 6ft tank and found some free stuff on the live rock.
Can someone identify this slug and what does it eat?
I also have a curly-cue anemone

 

[NarwhalLover3]

Looks like an abalone. Kinda blurry, so google abalone and see if it matches up.

 

[MINItron]

I agree. Looks like some kind of abalone. Could also be a cowry. It's hard to tell from a picture, but if that is his mantle covering the shell the it is a cowry.

Cowries are symmetrical along a straight line that divides them fore to aft. Abalones grow their shells in a spiral like any old snail it is just an extremely flat spiral so that the shell ends up being dish-like.

 

[Daviddes]

It must be a Cowry then, thank for the info.

 

[MINItron]

A few cowries are predators, but as far as I know most are grazers. They aren't often sold so it may be hard to find much info on which kind you have.