dark spots

If its from your plants in your only diary they look overfed, might be a complmaption from that.

This leaf shows signs of yellowing between the veins with the veins themselves staying green, a telltale sign that the plant might be lacking magnesium. The tips and edges also appear to be browning, indicating that the issue could be advancing. To tackle this, ensure the growing medium has the right pH for nutrient uptake and consider adding a magnesium supplement like Epsom salt to the feeding regimen. If you choose to add magnesium fertilzer always start with small dosages and see how the ladies react. Cheers, D.