training a fish to eat a new food is always touch and go, especially if the fish only eats live food and doubly so if it's a wild fish. 2 methods that i've personally found to work are:
1. "trick" the fish. find some way to mix the food you want to train them to eat with the old food they're used to eating (e.g. grind the dried food into powder, mix it with water into a paste and coat your tubifex worms with it before feeding) and feed the mixture for some time, perhaps a week or so...this way the fish will be used to the smell/taste of the new food and you can slowly get them to eat the new food exclusively
2. starve the fish. i personally try to avoid this method, but some people swear by it. don't feed your fish for about 5 days, then feed it with the new food. if the fish isn't too stubborn, it'll eat the new food out of hunger. once that happens, feed exclusively the new food for a week or 2 or your previous efforts might be wasted
it depends from fish to fish what method works, and for some fussy eaters neither will work and you'll end up either with a starved to death fish, or constantly having to feed it live food
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