My little Blue used to jump for his treats, too! The first time he did it, I was so surprised! I would always wet the tip of a paperclip or little plastic feeding stick, then use it to pick up a piece of brine shrimp, then drop it on the surface of the water for him. One time, I was talking and I waited too long holding the treat over the water, so he got impatient and jumped out and grabbed it off the paper clip!! From then on I would have him jump for his first treat of the day! But I would always just give him his treats after that one, because I didn't want him to think he HAD to jump for them, he deserved them anyway!!
I miss him so much. He was a great friend to me.