I'm sure we will hear that your cockatiel has decided he likes the bottom of his cage sometime soon. This is a typical tiel trait I was never happy when they did it, my tiels use to dig around on the bottom of the cage ripping up paper and causing a bigger mess sometimes I found them eating their droppings.
I had to get a cage with a grate to place over the bottom tray to keep the tiels from ripping and tossing paper strips everywhere and rooting around for seeds or food that dropped from when they ate earlier.
That use to drive me nuts!
Tiels are adventure!