Joanna, I have all sizes. Some are quite skinny, others quite plump. I noticed that the thin ones have circular stripes along their length whereas the plump ones are pretty much solid red. I wonder if there might be some other variety of worm included in the batch I purchased. I also noticed that the skinny ones were most noticeable near the top of the bedding while the plumper ones were farther down. Have you dug into the bedding to see if there's a difference? Are they consuming all the food they're given? I've seen comments saying to feed them every day or every other day but mine don't seem to eat all that fast. I seem to have plenty to new hatchlings when I uncover the food.
