Yellow diarrhea after change of food or something serious?

[Great_Strides]

New to chickens! Just got a few pullets a couple nights ago and they appear healthy. I had a bag of Purina layer pellets from when our ducks were still with us and so they ate that for a day until I could get to our local Bomgaars for chick starter. Switched to the chick starter last night. Their poop appeared normal until today. It resembles yellow diarrhea. I’m guessing it’s like any other animal with a swift change in diet but I just want to make sure my assumptions are correct. I’ve read about coccidiosis and so that may have worried me some Photo attached. Normal?

 

[Great_Strides]

I should also mention I gave them some meal worms!

 

[nuthatched]

Probably the changes in feed, serious coccidosis is usually bloody looking. Or maybe a change in habitat. If it continues over the next few days, I'd does with covid just to be safe. ;]