Have you noticed how colorful the tentacles become when they "deflate"?
I bet it
was next to the Plate coral but you just didn't see it there because it moved on.
Next question is, how long will it be before it gets sucked into that HOB intake we can see in the pic.

I'd be happy to describe how that intake can be modified to keep the Condy out.
If you would like to show a full tank shot we may be able to offer some advice.