I still don't know what he is. I'm guessing he's a juvenile bimac, judging by the markings and personality. He has the same markings as the older bimac that I had.

http://www.rebirthnet.com/Tank

http://www.rebirthnet.com/OctopusWithEgg

http://www.rebirthnet.com/NewOctopus

We put in a plastic egg for him to play with. He's constantly moving around and playing with the rings by pulling them down and making them go back up.

That's a great idea! I never tried an Easter egg. He looks like a bimac to me.

Best of luck with him!