if it moves then it's DEFINITELY a bta, because corals DO NOT move. That's a great find dude! and I'm surprised he survived the cycle because normally they don't. You need to feed it though, it's probably starving and could be dying. It will live under the T5 lighting in your RSM. You could put some zooplankton in your tank (500-2k um) for him to filter feed with. Brightwell Aquatics makes a good zooplankton you can use. Or if you want, you can buy some frozen food and feed it to him. Keep in mind that when you feed fish frozen food, you need to thaw the food first. I have little shot glasses that I use. I put about 3ml of water in it and drop the cube of frozen food in there for it to thaw. Then I have a little mini turkey baster I got from my LFS that I use to target feed my anemone with. You just squirt a little food in the middle of the bubbles. He'll eat it.