I did remember my dad would sometimes feed his ropefish feeder fish, back then, they were still doing research on diseases linked to feeder fish. He's big, the LFS here never has them, always on a wish list.
"And the next morning, all that was in the tank was the ropefish, Daddy, where did all the fish go!" What I said one morning when I was 10 after my dad got alot of feeder fish for his ropefish!!
It's possible that my ornate could probably fit his mouth around an end of my ropefish, but I really don't know that he'll bother. If he hasn't been tempted at all by the danios, I think it will work.
don't bother with flake/pellet foods, they might go for hikari canivore pellets, but i have other fish in the tank i keep mine in, so i can't say for sure. and COVER YOUR TANK!!! i had one escape while i looked away for a bit during wc, found him all dried out only much later.
they love any feeders slim enough to fit. especially guppies and platys. neons/cardis a bit too ex hehe