HELP! Brown spots. Any ideas?

[Newf]

This is my second grow. This plant is a Raspberry Cough from Nirvana in Fox Farm Ocean in 7 gal fabric pot that I am switching from the T5 to my 600 W HPS. I have hardly used any FF Grow Big nutes since they are in good soil and I keep the water pH from 6.0 to 6.5. Other plants seem ok. Spots seem to be on lower leaves. I did add a small amount of silica (3ml per gallon) last week.

[Potted]

Could it be just water splashed on them during feeding and left? Just spitballing were thay there before u switched lights?

[Newf]

Not from splashed water. I saw a couple brown spots 2 days ago and today brought them into the grow room and it seems to have spread. Only on the one plant and otherwise everything looks healthy.

[DrPhoton]

This looks like boron defficiency. Second symptom of boron defficiency is abnormal or twisted growth on younger upcoming growth.
This is what mine looked like when i had it. Boron deficiency is usually caused by ph imbalance or watering problems. I just gave mine a seaweed feed for a few days and it came right.

[oldjarhead100]

sometimes if your light is to close when you switch from t5 to ? I added some leds to my hps and found some spots not to long after , Dano might have it nailed though I use ageoldorganics for nutes they just came out with a new product called mycrosynergy it has all of the mirco nutes in it the stuff that isnt in grow soil. so far my girls love it