In these pictures he looks much less like Espy and more like aculeatus. Espy's arms were much shorter.
You might try offering about half that much food. It does seem that size makes a difference, especially when they are learning to take dead food, hand delivered. Mantle length is pretty much the max but we have found about half that size is the best starting place. We also notice ours eating the very small pieces and Cyclop-eeze (frozen, not dried) we feed the urchins, polyps and serpent stars.
Stealing the feeding stick is a game they all seem to play. Usually captured items lose their interest after an hour or so but occasionally items remain in their dens for days.
You might try offering about half that much food. It does seem that size makes a difference, especially when they are learning to take dead food, hand delivered. Mantle length is pretty much the max but we have found about half that size is the best starting place. We also notice ours eating the very small pieces and Cyclop-eeze (frozen, not dried) we feed the urchins, polyps and serpent stars.
Stealing the feeding stick is a game they all seem to play. Usually captured items lose their interest after an hour or so but occasionally items remain in their dens for days.