Weezy90answered grow question 6y ago Hi!
If the leaves are quite dark, you might have a nitrogen surplus.
I don't have a photo to assess or a diary to look at, but this seems the most logical based on what you've said.
If you're in doubt, you can flush your plant and adjust the nutrients.
Can you add a photo here and let me know which nutrients you're giving and the amount?
That way, I can try to help you better 🙂
Good luck!🌱