Excellent,
I've already removed that top layer soon after I posted, as you've suggested.

Over watering is due to the flushing I've recently done in order to correct soil pH.

Thanks you both for your advice!

-ps
purpleskunk777 Reviewed by purpleskunk777 on . Odd green growth...should I be concerened? Any idea what this is? Moss or something of this sort? I've been scouring the forum all day and can't seem to find anything on this. Use: Scotts premium potting mix/perlite FF Big Bloom Molasses pH is 6.5, right where I want it. Note the green growth coating the perlite in the soil mix. I'm wondering if this moss is pathogenic, beneficial, or neutral to the cannabis. Rating: 5