Was it eating at the store? Usually volitans are pretty good at eating frozen but sometimes they can require a little work. Something that has worked really well for me in the past to wean one over was to mount a small silverside to a semi rigid lenth of thin wire and then move it around in the tank as if it were swimming. If it continues to be a problem you may have to offer it some live guppies.
My fu manchu is about 4" and I generally feed it pieces no longer than 1". If that helps.
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