The one in the video practically crawled across her. She has two in there that I added and they are actually looking quite pretty in there - they are turning really red and I know that at least one has eggs so we'll see if they do any better in a system without anything that eats them!I have had a number of peppermint shrimp do just fine in octo tanks BUT the oddity is, no matter how many I have put in, ONLY one survives and the others are eaten. I am not sure if they kill each other and then the octo eats them or one gets an assigned territory too close to the octopus.
Seriously, though, it seems really odd to me that she shows no interest unless she recognizes them as cleaners, although I'm not sure that I've ever seen anything on octopuses visiting cleaning stations. She has eaten Nassarius, Astrea, Ninja Star Astrea, Trochus, Cerith, and Nerite snails now but still not a shrimp? Hermit crabs, fiddler crabs, emerald crabs, but again, puzzled by this lack of interest in shrimp. If this keeps up perhaps I'll add a coral banded shrimp to take care of some of the bristle worms. She grabbed 2 or 3 crabs again tonight despite not being all that hungry. She didn't really pay them much attention (she had 4-6 crabs last night as well as a snail) until one decided her arm looked like a nice meal or a pinching post. She then grabbed it, bit it, and then grabbed another one and held it until she was done killing off the first crab before taking care of it as well.
On a cool note, sorry, no photos yet, her arm that came in injured continues to grow and the arm that had the tip bitten off by the molly has begun to grow back.