No idea......

[RWillieK]

Here's a crappy, out of focus picture, but I can try to describe it. I found it behind my power head, stuck to the base of it pretty well. Its very stony, and has patterned ridges on it. Its sort of tear drop shaped, and has a small foot that sticks out the back - was using to stick to the powerhead base.



I don't know why my camera didn't focus on it well.....

 

[Will C1]

could be many things..try putting it on a piece of white paper this should help with the focous...first thoughts are a limpet but i really am gussing.

 

[Anonymous]

go here: http://www.reefs.org/hhfaq/pages/main_pages/faq_rock2.htm

a little less than halfway down the page. does it look like a limpet?