Get him on a good sinking pellet.
Mine eats Hikari sinking carnivore.It is also about two inches in length so I have to cut the pellets in half or else he'll take them in and spit them back out.
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Well great if that works for you.I am down to just a few fish in my collection that still eat live foods and the sooner I get them onto pellets the better...Dealing with feeder fish is a risky pain in the ass.
I breed and gut load, so I know my feeders are healthy.