Help! Have 2 month old chicks all with Impacted Crops- I think..??.

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Hi, i have a caged flock of 8, of 2 month old chicks..they all seem to have swollen balls on the side of their necks..i did some research and seems to be impacted crops...am i right???? A couple chicks are very compacted, while some have alightly smaller accumulated crops....what do i do.....i read an article that says to take away food, and give a stool softner, dulcolax, soap them in epson salt and message their crop to see if any comes out through their mouth.......why would this happen....they get fed and water daily..
i have an older flock that is free range and they eat a 3 grain scratch as a treat daily, and their fine! , and these little guys get a 20%scratch, 80%chicks starter mix....looks like the scratch is what is compacted. I can see the little pcs of corn through their skin....help!!!