It's an additive that is apparently really good at stimulating picky fish in to eating pellets. One of the big companies like new era or someone like that makes an otahime coated pellet that I tried to order from marine depot because I want to try and train my anthias on pellets (5 of 8 won't even taste them) and they wouldn't ship here. Not sure if it really works or not, but I'll never know!
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