Dark Phoenix Worms?

Dark worms have the most calcium. They turn dark and the end of the worm cycle and start crawling out of the muck to find a nice place to cocoon.
from what i have read,
from phoenixworms.com...

Q: Some of my Phoenix Worms are turning dark. Are they dead or dying?
A: Usually the answer is no. Turning dark is natural as the worm matures so this is seen more often in the large size. Dark worms actually have the highest levels of calcium. We suggest that you feed any dark worms first while they are still wiggly. Note: Dark, still, worms are trying to pupate but can still be fed. If conditions are just right, you may have a black soldier fly emerge in 10-14 days. Animals LOVE to catch the fly and eat it, too!
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