Well, just tried it. Not sure if they got anything or not; the videos of people feeding Acans all have them using some kind of tube to 'feed' reef snow through a small spigot right onto the polyps, and show the acans basically sucking the stuff down. Hoping they got some zoo plankton, or some cylop-eeze, I fed a bit of Reef Paradise food, along with some extra cyclop-eeze.

Next time I feed them, I'll probably use the top of a 20oz bottle, to keep the fish/shrimpcrabs/snails away. I'm still not sure how they got like this, though. All of them, save one small one, still have all the flesh of the inner polyp still, it's mainly the outer 'rings' that are skeletal on some sides of a couple different polyps.