Hey Wax32, do you have something like an eye dropper? I use one from a used up test kit that never had anything but tank water in it. My scooter associates anything long and narrow with a free meal now I think.
At first he was very shy of the eye dropper, but if you just move slowly and also don't just fire the shrimp out all at once... fire one or two shrimp at a time out very slowly right in front of them.