What is this bronze spot?

[Tommy57]

Other than these spots I'm not finding any issues. I looked at every disease I could find to determine what this is on my plant. None of the pics of disease seem to look like this. anyone know what this is?

 

[Growrx]

Slightly cal mag I believe

 

[Aqua Man]

Yeah looks like calcium.... not likely that you have to little but more likely its PH, salinity, watering or other. Hard to say without more info.

 

[Tommy57]

Yeah looks like calcium.... not likely that you have to little but more likely its PH, salinity, watering or other. Hard to say without more info.

My pH runoff is low. I've been putting water in at 6.5, coming out at 5.8 to 6.2. The whole grow. ????? Other than these spots, I'm at the end of the grow. ???

ILGM Sour Diesel, Fox Farm Frog soil. Water for the first few weeks then Cal-mag, GH nutes, very little used 2 ml of each. T5 lights. I'm trying to remember, lol.

Thanks for answering my question.