what is this?

[spongebob lover]

Hello everyone !! I noticed that i have this thing in my tank. I don't know what it is and if is it good or not, it has a little bit of black inside of it and it's white with a little bit of very light brown.
should i worry ?

 

[SaltwaterTeen]

Are you talking about those lil' specks in the circles?

 

[spongebob lover]

well the circle is how it looks on the glass and the half circle its how it looks from the side of the glass and i'm talking about the whole thing.
Do you know what it is?

 

[Hooked]

maybe a limpet?

 

[spongebob lover]

i'm sorry but i don't know what's a limpet and are they bad?

 

[Hooked]

They are not bad.

Take a look at this photo in the ID section of this site

http://www.reeffrontiers.com/photos_corals/showphoto.php?photo=529&sort=1&cat=537&page=1

 

[wrightme43]

Is it jet black with a white slit up the center of the back? if so it is a scutus.

 

[spongebob lover]

yes hooked, it looks like that but instead of brown it's white and i believe its belly is black