I don't know what's happening or what to do. I also want to know how to avoid it in the future.

They're all pepper saplings. Mostly renegade peppers. Some jalapenos.

I keep the soil damp, and i have a humidifier on constantly. They're below a grow light, altho the grow light is about 3 feet away.

They sprouted from their seeds strong and healthy green, then slowly they all became spotted.

I fertalize them about once a week w diluted fish food fertilizer.

HALP!