Pretty Stomatopod...I just lost mine (Bree) a couple of weeks ago. Her reef collapsed and I think something broke in her carapace. Sad. She was a joy. I had her over 6 months...she was 6 " long and had beautiful peacock coloring. I don't know if you know, but they are light-sensitive. I used actinic on mine and PVC for her burrow. She had made herself quite a castle. I like the color your's changed into. They get a bad rap. Speaking of, the poster wondered about the "hammer"...it is called a rapt. Just joined AC and don't know quite how to navigate yet...hope I haven't intruded.