Hello. We welcomed our first ceph last Friday. (1/31/14) Based on my location - and the little info I was able to pry from my LFS- I believe it to be an O. Briareus. However, once I can get some good photos - I will let you experts help! (He is a "him" until proven otherwise :) ) (After mentioning the name "Octonaut" it just kinda stuck. Both my husband and my 7 year old son loved it!) Unfortunately, I was not able to be at home during his delivery. The employee from my LFS (who set-up my tank and has been amazing!) brought the octo as soon as it was delivered to him, as they are not set up to keep them. My husband took this amazing video of him after he was drip acclimated and then released into our tank. He called it "recording his first steps!" I only caught a quick glimpse of him the first night. (2/1/14) The second night, I saw what I am calling the "arm dance." From his den, I can see him moving his arms around and it almost looks like he is tumbling around. (Although, he picked a great den, and its quite hard to make out details.) Then, in the middle of the night, I woke up to see him out of his den, but just at the entrance. He did a little head-bob at me. I did it back. He did not seem amused. ! (2/2/14) Another sighting of arm dancing inside his den. Did not see him leave the den. (2/3/14) No sightings at all. - not for lack of watching! (2/4/14) To my relief, more arm dancing and this time he was really letting his arms wander outside the den. I also noticed a med sized snail in his den... wonder if he will end up as dinner?