I don't know about Roubybush in particular, but I recently moved to only giving pellets in foraging toys for my Alexandrine. I got one of the clear plastic round ones that attaches vertically to the side of the cage and they have to spin the front to get food from the different compartments. My boys beak is so HUGE the holes it came with were far too small, but my husband drilled bigger ones with no problems. It could work if the pellets are too big for the pre-drilled holes too.
The other one I have is a tall one where they have to move dividers from side to side and the pellets fall a few at a time. I have to buy small pellets for this one (Harrisons fine) because anything bigger gets stuck. I have tried breaking up larger pellets, but this hasn't worked.
I also have a ball with holes, but that's out of cage only because there's nowhere to roll it in the cage apart from the floor.
