My new octo (which I believe is a aculeatus) is definitely not looking good. He is very pale and lethargic resting on a powerhead. I had my water parameters checked by my LFS and was told everything looked normal. I don't have the actual numbers, but he knows I have an octopus and is knowledgeable on their requirements. My octo has a mantle about 2 inches long and has tentacles at approx 6 inches. Is it possible he is at the end of his lifespan? I am hoping that is the case and it is not my tank that is causing the situation.