What are these marks? Bug....?

miking

Member
Hello guys in 5'x5' room 12 autoflower in 11 liter pots with biobizz lightmix soil with guanokalong fertilezer. After 4 week i saw these signs what are these signs? You can see in attachment. I didnt give extra fertilizer until now. I am using ph balanced tap water.
 

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Following. I get these marks from time to time pretty sure it ain't bugs.. I think it's down to pH imbalances causing lockouts and stuff
 
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