I don't think a little DE will hurt but I also don't think it will be beneficial. Meaning, it's not an alternative to Corid if you suspect Coccidiosis. 5-6 weeks is when I treat with Corid.Oh and one more question i love to use diatomaceous earth to help with the worms, will that be ok when the chicks join the flock at 5 to 6 weeks of age for it to be in their food.. i don’t think it will hurt. I will definitely use less but I just want to know what you think and your opinion about it!