It's good that the crop is not full in the mornings - especially if you are using a brooder plate or heating pad to brood the chicks. Crop function is harder to gauge if they have a light on 24/7. Feeling lumpy can be from chick starter or even a few pieces of grit that you are feeling. Here is good little article with illustrations about the crop and it's function https://www.mypetchicken.com/backya...s-a-chickens-crop-What-is-a-gizzard-H309.aspx More concerning(?) is you mention that something is up with the chick - can you be more specific? Is s/he lethargic, having trouble pooping, the vent pasting, not growing, etc. You mention that you have been treating him with Corid for the last 5days using an outbreak dosage (2tsp Corid per gal) Was this chick sick with Coccidiosis or were you using the Corid as a preventative measure? Also just to trying to cover all bases and questions that come to mind - what are you feeding your chicks? Are you providing your chicks with chick grit (crushed granite) free choice?