well, that's better news!
i managed to detach it from my toadstool, and i moved it more north in the tank. I know it looks washed out in the pic, but when i looked at it today, it's a much darker brown.
the "mouth" that i saw earlier turned out not to be a mouth... I found that when i moved it, the tentacles just completely sucked in so it looks like a golf ball, but with holes instead of dimples... is that something a xenia would do???