The mealtime referee struggle is so real! I have the same dynamic – one vacuum and one delicate grazer who was getting bullied out of her own bowl. I was constantly playing food cop. My lifeline was a microchip feeder I found at automatic pet feeder . The one I got reads my grazer's collar tag, so only her bowl opens. The vacuum cleaner gets his own timed portion elsewhere. It literally ended the food-stealing Olympics overnight. The grazer now eats in peace, and the other one can't hoard everything. It feels like magic after playing guard duty for so long. Definitely look into a selective feeder system; it gives you peace of mind and gives them both exactly what they need.