Something blue/green on soil?

Hi guys/gals,

2 of my pots have a very dark blue/green layer on top, it's hard to see in this photo but it's the best angle I could get to try and show it... I included another photo to show how the normal pots look.
Is this some sort of mold or something? I usually have a fan on them but haven't the last few days. The grow tent is open all day/night as they are still in veg and no smell yet.

Would it be enough if I were to just scrape away a couple inches off the top and replace with fresh soil?

Soil is sunshine mix #4 with gaia green added but the top couple inches are a potting mix because I ran out of sunshine mix at the time. I would be replacing the couple inches with #4 though.

Thank you for any advise!

Sounds like you have algae forming often due to excessive humidity. Try to decrease the humidity and be careful not to overwater.

Your gonna need that fan my friend!

Need to keep the air in your grow moving at all times Good Luck

thisbuds4u101 said:

Sounds like you have algae forming often due to excessive humidity. Try to decrease the humidity and be careful not to overwater.

Click to expand...

Thank you brother, I see the humidity is around 50% while the lights are on but last night I saw it was as high as 70% when the lights shut off which really surprised me. Starting today the exhaust fan will run 24/7 along with a fan for air movement! Will grab a dehumidifier if needed.

Thanks!

Always willing to assist a fellow grower I know they’d do the same for me.