That is a Blue Tip Stag Horn. When I first joined the local club, a guy posted a thread called Pay It Forward. He said when he got in this hobby, people just gave stuff to each other so he wanted to help out some one just getting started. I took him up on it and he gave me 4 nice frags. That was one of them. He has since become a good friend. A couple of months ago his tank crashed. (turned out to be a broken heater frying everything). When he got it all straightened out he had nothing. I was able to give him back a big chunk of that as well as several other cutting from my tank. Just shows to go you, what comes around goes around.