[Octopus]: Seven + - Unidentified - Newbie with Octopus meant for sushi

They can display and retract a variety of papillae (little flesh branches) and the Abdopus group often displays them at the top of the eye making them look like horns. I will try to get @mucktopus or @Neogonodactylus to take a look a the pictures as they have observed hundreds of this species in the wild.
 
I've been reading the forums about senesence. Could it be this? And not the water? I've already changed the water, and his tentacles still end in a corkscrew. Other than that moment I was able to take pics, he's been hiding in his cave. He's refused all the food I've given the past 5 days. (I don't know when all the snails went missing- I only noticed it when we moved tanks, so it could have been then, or it could have been earlier).

The only time he's been out was this morning when I offered him a clam by putting it near the mouth of the cave. He got the clam, swam to the other end of the tank, threw the clam there, and swam back to hide.
 
Yes, these are signs of senescence but can also be signs of stress. Alternately, if Seven is female, all but the corkscrew arms could be signs of upcoming brooding. Sometimes stress can be overcome but not the alternatives. Do continue to try to feed.
 
Glad to encourage, especially with your unusual way of being introduced but I wish the outcome had been better. Missing my octos, about time for me to seriously look for a new resident.
 
Seven finally came out of his cave today, and he looks terrible. He looks really pale and one eye looks sunk in. I'm guessing it's just a matter of time :frown:
 

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Is there a humane way of euthanizing Seven? He's still hanging in there, but looking really terrible.

And I got my API test kit today. A little late for Seven, but I'll chalk it up to experience.
Today is water change day, and these are the results from before the water change.
pH 8.0
Ammonia 0
Nitrite 1.0ppm
Nitrate 10 to 20ppm (somewhere in between)
Salinity 1.025
Edit: forgot to mention the other creatures in the tank: a couple of snails, 6 clams, and one starfish.
 
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Thanks, DWhatley. It's certainly something for me think about. We watched Nine die, and it was very upsetting waiting for the end- and even in the end, we weren't even sure as it was not breathing anymore, but the legs would still twitch and change colors.

Prior to this I was so sure I would get another octopus again, and soon. Didn't think I would get attached to these creatures this fast.
 
Unfortunately, it comes with the territory but, for me, the empty tank was too lonely and nothing else would fill it properly. After the death of a really special one Neal and I talked about accepting the fact that their life spans were short and if I could not accept that, I should not keep them. Since then I have kept over 20 others and each life is rewarding and each end of life sad but the former has outweighed the later.
 
Seven is still alive . He went into hiding after I posted that last photo, and changed den. He covered the entrance with sand so I can't see him at all. He finally resurfaced the other night, and it was my husband who chanced upon him when he came down to get a drink. He said Seven was swimming/dancing. I only caught a short part of the swimming, then he positioned himself on the glass.

He's less pale now, but still has those corkscrew ends. I'm not sure if he's eating. I've seen him cover a clam I've left and would seem to be eating for a minute but would throw the clam out after. I can't tell if he's eaten a part.
 

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