Thanks Dave, I have a lot to learn but that's one of the reasons I am enjoying Bob. I found this blog many years ago but I never thought I would be able to have an octopus. I feel privileged to take care of such a fascinating and intelligent animal.Blue is actually indicative of day for marine animals. Kind of funny that moonlights are marketed for night viewing and are blue, but because of the penetration it cues daytime behaviors (coral and reef geek here).
Another good tip Dave, thank you. Those are some random cedar pc's someone gave me. I love the smell of cedar. I will p/u some more wood for supportVery cool that he is out and about! The video played just fine for me.
One concern, though, is how the tank is set up. Glass tanks put all of their pressure along the edges of the tank and with how yours is supported along the middle and then with a board at the corners, this leaves the longest panes unsupported along their length. I would definitely add a solid board beneath the tank to eliminate the stress and pressure on those seams. If this is the 30 gallon tank, you are looking at about 200 lbs of pressure being exerted unevenly across those side panes.
I am so glad I got those initial videos but I do like to document everything with notes and video. I have hardly seen him since then but that's alright. If he is going to come out more in the future that's great.I watched the video a few times and think the "he" pronoun is correct. There are no external distinguishing trait for a female but the male O. briareus will curl the third right arm (clockwise as you orient your eyes with the animal's). Bob does not keep his arm tighly curled enough to be be sure and is moving too fast to see the associated channel but he does seem to keep the tip of the third arm curled while the other arms are straight. Here is a thread that discussed the hectocotylus along with photos of the external identifying male traits.
Guessing an age is never reliable but I believe Bob is a couple of months older than Shiitake but still young. We have unofficially noted a "dent" that appears at the back of the mantle at about 7 months (guessing on timing here) and I see only a suggestion of that dent on Bob so best guess is 5-7 months old. This is a good age as, if I am close, he will be entering his predator vs prey age and should be more willing to be seen than a younger animal.