I have had my octopus for over a month now and he is doing well. He aggressively eats freeze dried shrimp every morning, he actually took one from one of my starfish this morning before going after the 2nd one (greedy glutton). He has not touched the two hermit crabs I put in the tank more than two weeks ago, but that is OK since he is eating consistently. My problem is he hides as soon as any light is on in the room. When the aquarium lights come on, he disappears into the rocks and you would never know I even had an octopus in the tank. I can look at him using a red lens on a flashlight, but you don't get to appreciate the beauty of their ability to change colors and texture with that type of light. I was wondering if anyone with a similar situation were successful using a blue actinic light which I think would display his colors more so than a red light. My tank is a 75-gal standard shape with 30 pounds of live rock and a 5-inch deep sand bed. I also have two chocolate chip starfish (one 3-in dia, one 6-in dia), a mine urchin, two turbo snails, two conchs, a tiger tail cucumber and two hermit crabs (meant to be octo snacks). My water temp is 76 deg and salinity is 1.026. I'm happy my little guy is doing well, but if I never see him, it taints the thrill of ownership and you can newer show him off to friends and family.
Any advice will be greatly appreciated,