I saw it only for a second this morning when I turned on the lights. When I first got my rock a few days ago there was a huge clam blocking my view of this spot but the clam decided to move elsewhere, so this morning I was able to see behind where it was attached. There were maybe 6-8 tentacles poking up from the rocks, about half a fingernail tall. It's a tiny baby whatever it is. About 2-3 seconds after the lights came on the thing retreated and it hasn't come back out over an hour later. The tentacles were definitely anemone-like. They were transparent with spots of color, orange I think but not 100% sure, and in shape reminded me of a bubble tip anemone. They were arranged in a ring but not all at the same height, so I think it was laying along an irregular hole in the rock and conforming to that shape a bit. I can find no trace of it now and obviously I didn't get a picture as I was not expecting to see a thing there lol. It did not look anything like an aiptasia other than being anemone-like. The color and tentacle shape were all wrong. Any ideas? Oh and if it helps any the rock is from off the Florida coast on the gulf side.