White spotting on leaves

Mavadines

New Member
Hello everyone, new member here that's nervous about an issue that's shown itself over the last week or so.

Promix HP

Super Silver Haze CBD (Feminised) - by Green House Seed Company Amsterdam
70% SATIVA - 30% INDICA
5 plants (4 are clones of the larger one)
Just started week 4 since the switch to 12/12
Indoor - 5'x5' tent
Promix HP
3 gallon smart pots (large plant in a 10G)
Light HLG 550 V2
Temps - 74-82f
RH 45-55%
PH in pots - 6.2
PH of water/feed - 6.3
No pests visible
Watering daily 1L (large pot 2L) - alternating water and nutrient days

Fertilizers currently used
Green Planet Hydro Fuel Bloom A - 1.5ML/L
Green Planet Hydro Fuel Bloom B - 1.5ML/L
Green Planet Vitathrive - 2ML/L
Green Planet Rezin - 2ML/L
Green Planet Massive - 5ML/L
Green Planet Liquid Weight - 1.5ML/L
Green Planet ProCal - 1ML/L
Advanced Nutrients Rhino Skin - 1.5ML/L
Advanced Nutrients Sensizym - 1.5ML/L
Mammoth P - 0.16ML/L
**Recharge and SLF-100 every 8 days on water day

Any ideas on what this white spotting is? It seems in the leaf and not on the surface. Doesn't rub off. I have been running my in-tent cool mist humidifier fairly hard and just using tap water. Could it be some type of mineral deposits or something like that? It's worse close to the humidifier and on lower leaves, however there are some white spots on upper leaves. I do have good airflow in the tent. Everything looks healthy besides this, and growth has been good. Someone has suggested to me to up the CalMag but I haven't done so yet. The Green Planet ProCal has 2-0-0, but i do also have CaMg+ which is 1-0-0 that i could swap in instead.

My first thought was mites, however i have inspected many of the leaves and can't see anything. Also don't have a single bug on the sticky strips in the tent. Please ignore the burnt tips on the lower leave photos, that's an old issue that was rectified.

Any thoughts would be much appreciated, thanks

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FLWRCLOSE.jpg
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