Good Job! If more people tried it they would realize their rays will also eat from their hand. I have 6 out of my 9 my rays eating from my hand and since I don't really want to get my shirt wet as the tank is 30" deep I just taught them to come to the top for me and eat out of my hand.
I'll have to try this some time. I have been trying to get my motoros to hand feed. I have my 2 captive bred ones interested and then my wc motoro likes to scare them away from me. So I've been working on her.