need help to identify

[justin_ny]

anybody know what is this. it look like sea slug, and hard when i touch it, and white.
is this thing good in the tank ?

 

[rickster]

This is only the second known occurrence of this on Earth. It is believed that it is a silicon eating slug of high intelligence seeded by a falling meteor....
Sorry, seriously....how big is it? Get a better pic. How fast is it growing?
Are you going to quarantine it?

 

[justin_ny]

i dont quarantine it. it still in the main tank. it always come out when the lights off. for the picture this is the best i could do. 20 dollars digital camera from walgreen, hihihihi