You have to train them to eat floating commercial food, most of these fishes are wild caught and are only fed live food at the LFS... like Aquatic Avenue, they mostly feed all their retail fishes tubifex worms.
So you'll just have to continue feeding the commercial food and hopefully when they are finally hungry enough, they will eat it.
Btw, if your tank isn't covered, you will need to cover it. Hatchet fishes are expert jumpers... they are built to "fly" out of water to catch prey.![]()
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