So...I am very pleased at what Di thinks I have!! He came to live with me a week ago today from That Pet Place, Pa. He is so awesome! Very personable and curious. Eating well and has chosen to remain in the barnacle in the front of the tank. I love the many different looks he gets. He can go spikey white, to zebra legs with a dark patch down his mantle. When I catch him out stalking something, he twitches all the way back to his barnacle. Seems to be day active. At night I have been shutting down the light and in the morning he has his door closed with one of the shells. Usually he comes out when I am not aware but notice this all white spikey creature sitting on the outside of the barnacle. So far, so good! Keeping fingers crossed!!! And I'm thrilled to be a 2 octo household again!!