The why, oh why, 38 stair, 290 gal build revised

[reefwithareefer]

I am not sure what this is called. I do know that when I nuked my tank awhile back, it was killed. It had one "head" and the tentacles were about three inches before I nuked the tank. I decided to leave the "shell" in the tank thinking one never knows. About 6 months later you could see the tiniest bit of color begin to come out of it and another 3 months or so it looks like this. Multiple heads and the tentacles are about 1.5" long. Never would have thought it would come alive again. I never throw anything out anymore, just to see what happens.