i'd be trying hikari sinking carnivore pellets, then massivores.... i'll bet your fish could go quite a while without eating, a week would be no problem, even 2 probably, but watch him.... if his behavior changes, or he seems delerious during the starving process, then give him whatever he will eat to get his belly full then try again.... the sooner you try pellets the quicker he'll go, the longer you wait and feed other foods the harder he will be to break later.... also try the pellets, if he ignores, wait 2-3 days before trying again, so he's nice and hungry, you may get an instinctive hit... .also if he mouths them, he will eat them eventually without a doubt
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