Are you positive it's not a worm of some sort? I agree that shrooms do sometimes show their stomachs, but the pic looks too uniform. Does the tentacle come out of the white "tube"?I have a mushroom coral I got from a really reputable shop. It’s really healthy and doing great in my tank. I started spot feeding reef roids and noticed a little white tentacle/worm popping out whenever I spot feed. Is that it’s feeding tentacle? Or what exactly is it? If anyone could help me understand and learn that would be awesome!