Yellow Spots On Leafs

[Carliios]

Hi all, the bottom fan leaves have started to get yellow spots across them. I’ve checked and I couldn’t see any pests even with a microscope. Though I’ve seen people call these junk leafs in other threads and it’s quite normal apparently?

I’m using Plagron Growmix and adding 0.5ml per litre Sugar Royale and 1.5ml per litre Power Roots with every watering at week 3 day 2. The tent has a 4 inch Mars hydro fan set to 2/10 speed at all times and a small fan blowing air over the plants. My humidity is around 50% at all times and around 21/22 Celsius
I have a fecida 130W light on 24/7 and moved it up last night in hopes that it would help but not sure it’s light burn?

 

[namvet25]

Might be from water or nutrients on leaves but not to worry it happens so try not to get anything on the the leaves.

 

[Cannaficionado]

If its starting from the bottom you might have a cal mag deficiency. Or lack of nitrogen. Start with a ph test of the medium and go from there