Leaf spots

Can anyone let me know what could be causing this and a possible solution to correct it? This is a hydro grow in a RDWC with 2 x 200w (advertised) light and 6 x 65w (advertised) single bulb lights. Pulled a male the other week and this one is in a smaller net pot than the male was. I left it in the smaller pot because it was already developed and may harm it to transfer it. These spots are not on every leave, more of the larger fan leaves. Any advice appreciated.

Searching showed maybe a pH problem? What is the easiest, cheapest way to get the pH up or down.

2ml calmag + 1/4 tsp Epsom salt per gallon. It's really just a mag issue, but if you always add what I first recommend to your mix, you won't ever have the problem you are having, ever again!

I agree definitely a ph issue. 2 things if you don’t have get them a simple moisture meter and a good ph meter. Especially if your new at growing. Let your soil dry slightly then feed cal mag 1-2 ml per gal. Good luck! Keep us posted

If all your nutrients are being supplied then it’s easy to assume it’s a PH problem. Looks like a calcium or mag deficiency to me, probably not up taking due to ph being out of whack

I have fox farm that I use and I cut back on it the last few weeks since others suggested it was too high at 585ppm. This is a hydro setup and I just tested the pH and it is at 5.83. I did add water to a low reservoir yesterday when I took the pics so mayne the added water brought the pH up into range? Would i still add Epsom salt and calmag if I already use the fox farm? I use about one cap full per 5 gallons water added. This is about half the recommended dosing. Thanks