Can you ID this snail and this algae?

[kirinreef]

It's the brown patches. Picture taken after tank lights out.

 

[Schnizzle]

Snail looks to be a Trochus to me.

 

[DSC reef]

Can you take a few more pics of the snail. From the angle it looks very flat like a sundial, hopefully it is a trochus.

 

[hyprc]

DSC nailed the possibilities for the snail.

The brown patches could be brown cyano or lobophora if it starts matting up and scrolling (there are other possibilities). It's strange that it's in so many tiny patches and not fewer larger ones.

Edit: guess I should be more specific, I meant lobophora variegata.

 

[kirinreef]

I will try to take more pictures when I get home, I usually find them at night, and their shell does look flat. Guess I will pull them out of water.
For the algae, they only show up on the rock that direct under the light, and only in small patches.

 

[kirinreef]

Few more pictures on the snail.

 

[reef lover]

Check the trap door if its cone shaped remove him.