There are differing opinions on how often an adult octopus should be fed. We feed ours daily (twice a day is definitely too frequent for anything but a hatchling though I think LittleBit, O. vulgaris, might have been willing to accept an additional feeding) with a one day a week fast (but will give a small treat if the animal insists it is hungry). Many keepers feed once every other, every second or every third day (but with more food than a daily routine so total food seems about the same). There is some circumstantial evidence that skipping meals extends the lifespan. I'm not sold on this observation for warm water species. IME, they will not overeat, will eat ravenously just before brooding and take less food (sometimes skipping days) once they begin to enter senescence. During final senescence and while brooding, most will not eat at all (I keep offering though and some, the ones that live slightly longer, will continue to eat small amounts).