I use a small 8oz Solo cup and in my girls cage it's glass so I put it up close to one of her vines. The cup is on a suction cup with a 2in side cut off, up really close to a vine. Now with Ringo's since his is a screen cage, it's tied to the screen next to a vine. My 2 cham started eating from the cup instantly the first time I put it in there. So I'm not sure how to get yours use to it.