I feed my bp out of her cage and it's always worked fine for me. I get that it can stress them and all, or identify you as food time, but it works better than you think. If you just take them out and put them in the tub with the food ready, there's no hassle. And you don't have to worry about substrate sticking to their "Spit" on the prey as the snake was grabbing on to it. It's an issue with a bioactive enclosure with the moss and the dirt stuff. It happened to me once and i had to pull moss and dirt/small sticks out of my snakes mouth. She'd been trying to get it out for like 10 mins and it was difficult to pull moss out of a snakes mouth lol.