This is my first year trying seedlings, and I have some leek seeds about a week and a half in. Around 20% of the seedling containers have green discoloration to the soil. It doesn't look fuzzy at all, just a greenish colour like I'd dropped in some food colouring.
Should I be worried about this? Is it fungus? I used seedling starter mix and there's a cover to the seedling tray, but there are fungus spores everywhere so I could definitely believe there is some contamination.