Don't put your sav through the stress of a feeding bin, you just got him. Take him off the cypress and put him on a Top soil sand mix, 50/50 or 75soil/25sand, what ever works for you. Keep mixing until you can make a solid ball in your hand that doesn't leak water and doesn't fall right apart.

If a little dirt gets ingested with proper temps, you should be fine but chunks of cypress is a different story, try using tongs as we'll.

Pics of your cage? What are your temps? Just curious.