im hoping someone can clear up some octopus questions for me. these pics are off of key west. the first is of an octo we call gertrude who lives on a wreck in about 80 ft of water. when i first encountered her, she(?) was trying to camo herself on the side of the wreck. i stroked her gently, she flashed colors a few times and then reached out with a tentacle wrapping it around my finger. we held hands for a few moments. this was in february. now i see her about 2x a week and have tried pulling off some of the crustaceans from the wreck to feed her, but she doesnt seem interested. i cleaned all the old shells away from her lair thinking it may have been an easy trail for her predators, but i have noticed no new shells. is there something i can buy at the store to feed her that would be safe? also wondering what type of octo she may be: common or caribbean reef and how i can tell the difference!