Would LRS frozen work.
While that's a good food, it still doesn't have the texture and look of a natural food item, so it will take some training for the fish to accept it, less training than flakes or pellets, but still some. The idea behind using natural whole or live foods is that there is less training involved. All of this only applies to fish that are in the process of adapting to aquarium foods. There are other reasons why a fish won't eat in captivity...health issues, diseases, having been caught with cyanide, etc.
I recently posted this short article on relative feeding responses in fish:
Relative Feeding Responses in Fishes
Evaluating how well a fish feeds is a vital aspect of understanding the overall health and well-being of that fish. Experienced aquarists, familiar with the species being fed, will have an innate understanding as to whether the fish is feeding well or not. With new species, or for less...
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