Welcome to the forum.
It sounds like your cockatiel is teaching YOU how to be its slave.
My budgie also takes a seed out of the food dish and jumps up on a higher perch to eat it causing the seed husks to fly all over the place instead of just in the food dish. Its not anything you should worry about, your bird is young and just getting a feel for his food and his eating habits might change in time.
Birds do toss seeds around and the husks will fly around as well when they jump or flap in their cages, this happens with every bird in a cage. You can put a seed guard or seed catcher around the birds cage to catch the flying husks and seeds he tosses.
Really I advise you just get use to it and face the fact that there will be seeds and mess and you should vacuum around the cage every night before you cover the cage for the bird to sleep.
I vacuum sometimes 2 times a day, I vacuum every night before I cover the bird in his cage this is because I live in a house that sometimes gets mice when the weather gets cold. I don't want to attract pests so I learned to be vigilant in cleaning.
Don't fret about a messy bird, like I said he's still young you really don't know what he will be like for a while yet.
This is what a seed guard or seed catcher looks like, you can either buy one or make one they aren't that difficult to create.