Yep, Hikari sinking carnivore is one of the foods I feed.Have you tried hikari? Massivore and carnivore have a particular smell that my bichirs love.
What you could also do is add a bottom level fish that will take pellets. This worked for me I luckily got a WC del that would readily accept pellets and pretty much every fish I've gotten has learned from it to eat pellets. This doesn't always work especially if the poly your trying to pellet train is the first one. But as others have said polys usually don't starve themselves it just may take a little more work, but with enough determination you should be able to get it on pellets one way or another.
The weeksii shares the tank with a del and albino sen that both eat pellets, so not really a monkey see, monkey do situation....

