....i haven't kept an octo for awhile now but here's the deal. My second to last octo was great, had him at least 6 months, very active (about 2 years ago) well a twin spot wrasse I had in there started messing with him when he grew bigger. So I finally caught the wrasse, and gave him away. Well the octo was kinda damaged, like 3 or 4 tentacles were like half gone. Then he just disappeared. I have a 110 gallon w/ alot of LR. I knew his hiding spot under one of the rocks. Anyway I never found his body out my tank and the rock formations are to big to go hunting in my tank for him. Water quality was cool......so big mystery. Then a few months later I bought another octo and never saw him again after day one. Again no body out the tank. I've noticed the bristle worms seemed to ambush a chocolate chip star the other day and did him in and they try to do the same to turbo snails i think. I wouldn't think an octo would allow itself to be eaten by bristle worms but that's the only possibility i can think of.....whadaya think?