Mine have done the same thing on occasion. I shut off the pumps and put a couple of mysis on them. If they are hungry they will eat it, if not the food slides off. I assume the animal is pushing it off. I've got one atm that hasn't eaten for over a month, his color has declined a bit but still puffs up nice and fat, no feeder tentacles. I'm not worried about it yet. The other one eats anything, I usually feed it mysis, but lately have moved upto a whole silverside every couple of days. It actually ate 2 whole silversides last night.
Try to keep the hermits and shrimp away from the brain while attempting to feed it. I've got a couple of hermits that see a lunch wagon whenever the brains are being fed.
HTH
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