How to combat your household seed thrower

Since we've been giving Mango his new diet, we've noticed a particular issue. When he was on a pellet diet, the crumbs just drop straight down. Now that he is on a pureed sweet potato and seed diet (in the afternoons) he has become ballistic nightmare. Sweet potato covered seed projectiles cover the surrounding area. We came up with an idea however that has helped cut down on the amount of wall-washing we perform on a daily basis. We went to Menards and bought a piece of plexi-glass and hung it with some adjustable links on the side of the cage where he eats. Now he can safely (mostly) test his seed whipping ability without plastering our walls. We just have to take off the plexi-glass occasionally and wash it.