Diarrhea after food change ?

[UrbanHenKW123]

Hi there. My girls are just about 22 weeks now. One is barnyard mix, BLW and barred rock. It’s the barnyard mix that’s having the GI issues. I ran out of grower before I could switch them to layer feed. So I had to do the switch abruptly. I will say they have had perfect poops before this. It’s been almost three weeks since the food change and one of my girls is having watery diarrhea. Not an increased amount but when she goes it’s like straight water pretty much. No blood mucus or anything else. I’ve tried poultry probiotics. I do have dewormer but I’m hesitant bc I’m concerned it’s going to cause more diarrhea. The other two aren’t having the same issue. When I changed from starter to grower - I noticed some runny poops for a few weeks after that as well. Never had this issue before.

Any suggestions ? Anyone have any experience like this that it took this long to clear up after a food change? Should I get a different feed?

Thanks !