Hi, welcome to BYC!
So you must realize that DE doesn't work as a wormer. But I agree with @Beekissed and think you are jumping the gun to assume worms caused a death in an otherwise healthy bird in under two weeks. You might be busy... but taking a fecal sample to the vet could at least...
OK... so worming happens to be the topic of the week....
And there will be a lot of varying methods and opinions. You just choose what seems to make the most sense FOR YOU.
Here is the link...
https://www.backyardchickens.com/t/1059889/to-worm-or-not-to-worm-that-is-the-question
Yep, but many people DON"T rotate their wormers.
I didn't indicate that lack of maintenance was THE problem... but if you don't think overcrowding adds to worm, disease and parasite load getting out of control, you bet I will disagree away. Yes, I noted that SOME worm load was normal. So I...
I have to disagree whole heartedly with this statement!
Worms and other organisms build immunity to these things that get over used! Do not use it unless you need to. Plus a "broad spectrum" might not target your area of need.
I have NEVER wormed my chickens in 6 years or felt the need to...