Hey Denise, definitely looks very similar but this one is smaller it seems. If you compared my kids hand to an adult hand it would still be small. Will try and get a video of it on my hand or perhaps a ruler.
Added a bit to the tank for it to eat if it wants. Added 10 margarita snails and also 11 small hermits (assortment of blue, red, and other tiny ones, all potential food or play items). It took a piece of krill the other day but wasn't as interested as it was before so I bought some emerald crabs and it has enjoyed eating those along with making for a far better hunt as it instantly goes after these and hunts them down. Fed it a larger one today with larger claws and it was neat watching it navigate the claws by grabbing them first and then going in for the kill, kind of like putting a full nelson on the crab and then biting its head! Will see if I can find a small jar for it to navigate and earn its crab dinner tomorrow.
Someone was hungry today. Saw it trying to eat a hermit crab so I tossed an emerald crab in and it ate not only ther hermit and the emerald crab while I was gone but then it took down another hermit crab when I got home and kept on picking up the remains of the past two emerald crabs looking for a snack. Getting an order of fiddler crabs tomorrow so that should provide plenty of food for it to be happy (dropped the other emerald crab into some live rock so it is no longer anywhere to be found). Tried to entice it to play today (along with two of my daughters) but it was too hungry to want to do much and basically treated us like we were in the way as it moved by our fingers in the water.
Thinking that Denise is right about as the octopus has not shown any growth yet. That said, it rarely if ever hides, choosing the glass or the top of the rock more often than not and hiding mostly at night.
On the feeding front, it has mowed down most of the hermit crabs and has eaten some fiddler crabs as well, although it seemingly does not like those. I ordered a bunch of fiddlers but most of them died after getting them and the octo did not seem to like them much at all. After pouncing on the first it seemed to avoid them until it was hungry enough, often leaving them for a couple of days. These are all dead now so won't be getting more considering it doesn't seem to like them and I had such a hard time keeping them alive (except the ones I threw in my lionfish tank, several of which are still alive).
Stick feeding frozen seafood, however, is a big hit. The second anything hits the water, the octopus goes crazy, turning a deep black, and grabs the stick. It has eaten more krill, chunks of shrimp, and pieces of scallop. I will continue with a variety and if I can find the emerald crabs that escaped my holding container I will toss those in there, too.