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Thanks much for the comment. I was going to try your suggestion. By the way I have added very little nutrients to the starting soil. Almost every watering to date I have used plain old water out of the sink. Of course water does not have buffering capacity. The water is about pH 8 going in...

I did the slurry test two plants and found the soil pH to be 5.4 and 5.5. Is that what FFOF soil tends to run?

I added some perlite to the soil but otherwise used FF soil straight. Interesting you asked me if I used it straight or added lime. Do you regularly add lime to your FF soil? I did a slurry test of the soil in two plants and found pH 5.4 and 5.5.

I was cleaning the cover to the carbon filter right before the leaf spotting occured. Still only one plant was affected. It was the closest one.

It was plain water on the leaves. I was spraying the bottoms of the leaves.

It's plain water you see on the leaves at the time photoed. I was spraying the bottoms of the leaves.

Additional pics

More Info: Donny Burger Indoor 5 feet x 7 feet x 8 feet (8 feet is the height) Soil - Foxfarms Ocean Forest water pH is 8.4, runoff pH is 6.4 Foxfarms Grow & Vitamin B-1 Temperature 64-72 degrees - taken at plant level Humidity 45-60% - taken at plant level 1000W LED 24 hours 440 CFM 6 inch...

Could this be a fungus? Could this be a pH problem? This is a Donny Burger veg plant about 3 weeks old in Foxfarm Ocean Forest soil. The only supplements added so far are Foxfarms Grow and Vitamin B-1 both in mild doses. The light source is a 1000W LED. The temp and humidity have been steady at...