I had a bit of a hard time getting mine to open up at first to feed them. Typically they liked to open up when I was already in bed sleeping, lol. Someone told me to try adding a few drops of coral amino 15 min or so before I wanted feed. Worked like a charm. I've been using Brightwell Aquatics Coral Amino and they extend out every time. Then I just squirt some mysis to each head and they gobble it up.
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