What size pellet? Formula 2, small or medium maybe 'big' for your flame angel. When I had a 'centropyge', in particular a coral beauty, it very much preferred picking on rocks and nori sheets. If you want to wean it on pellets, try smaller pellet size such as Spectrum Thera-A, Elos or smaller particulates. Give it some time and eventually it will get accustomed to your feeding offerings (mysis, spirunelia brine). Best of luck with your flame...
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