What is this?

y2says

Member
I don't know how to post a pic, but in my reef tank that's been running for years now has a lot of small looking sea slugs that are around. Most are about the size of the font on this page. At first I thought they were sponges, but one day I saw them move ever so slowly. Can someone post a pic for me if I email it to them? So far the corals are fine, but just wondering if I should be worried. :help:
 
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