I have feed my adult black an XXL rat about once a month and even that seemed like it's too much for her metabolism. They definitely don't need rabbits. With her feeding response, you'd think I was starving her.

And she's going on a diet.

About the setup thing..I would never keep a blood in a glass tank. You'd never get the right humidity. It's more important that you get your setup right with a blood than with a ball, before you get your blood. They are more sensitive to husbandry issues.