What is that WHITE THING?? HARMFUL??

[s62]

Hopefully not white powdery mildew? Also, how far away is your light? Looks like your seedling is really stretching.

[akshay315]

Hi Guys! It's raining here since 7 days. I'm little worried about my seedlings because there is some white substance building up on the soil. Is it mould or something?? Is it Harmful for my seedlings? Please help me out with this guys. How to avoid and all.

Cheers!