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You can feed them just about anything. From my experience all the DGs I've kept tend to LOVE the sinking shrimp pellets. They carry them around slowly eating at them as they go. Fun to watch too.
Flakes are fine, they also love frozen brine shrimp and blood worms. I feed him a few peices of boiled shelled pea from time to time. I would avoid dried foods like shrimp, bloodworms,and most pellets. They are prone to constipation and swim bladder like their cousin the betta.