Mixing 5% of Diatomeas to my soil

Can I mix Diatomeas into my super soil mix to kill pest? I have just finished making my soil for my first grow.

Yes I covered the top of my soil like a blizzard lol before I went to coco

Have you heard of Neem pellets? On YouTube, the recipe is Neem pellets mixed with water and adding that to your soil before planting your seeds