My wild broke after 2 days, I think having another ray present helped expedite it. My guess is that lights on and no sand leaves him/her feeling very insecure. It might be presumptuous of me to say you don't have any sand though. My experience was with a marble pup, only tankmate was a hystrix hybrid. I think watching the hybrid eat helped her but that is little more than assumptions based on observation. I left lights off the entire process and offered worms 3-5 times a day. I fed very sparingly with each feeding and she quickly became a competitive eater. Lights were off for the first week, she was on frozen before she had eaten under lights. When I finally flicked the lights on it was as they went full Ray feeding frenzy mode, and she didn't seem bothered by them. Hope you get your motoro eating soon.