Yellow spots on leaves

[stepollo]

hi guys.. this is my third grow. i use 600w hps for veg and 2x600 for flowering. my plants are in soil and i used some root stimulator. after some days in veg two of my ten plants got sone yellowing spots on leaves. but the plants looks healty. i cant find nothing similar on internet. can someone help me please? i checked ph and everything seems good. summertime is the only problem(29c with lamps turned on)

 

[Rahulik]

It could be still nutrient burn, How do you water them? Bottle feef ? Some water drops may cause little yellow spots imo. i could be wrong, but if evrythyng seems nice, and new growth is normal then all good

 

[rickerred]

this may not help but I had yellow spots so I did a flush, 1 tbsp Epsom salt in a gallon of water spritzed on the leaves and cal-mag worked for me. not sure which one but spots stopped none the less.

 

[IndigoBreeze]

Nutrient burn shows up brown on the very tips first. I was going to say it looked like a calcium or magnesium deficiency so I'm not surprised the Cal-Mag took care of it.