Is this fouling?

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MrWrasse

Aquarium Advice Regular
Joined
Jan 10, 2004
Messages
64
Location
Weyers Cave, Virginia
I think this is fouling, but it almost seems like it has an opening for filter feeding. What do you think?

The first pic represents the color well. The first pics color is off. The actual color is more like the 2nd pic. The circled area is what seems to be a siphon or mouth of some sort. Both areas have this questionable mouth like slit, and they both seem like they react to touch.
 
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