Little brown spots.

Good day,

I have never come here with a problem, but I am getting a little bit of brown spotting that I just can't shake. I am fairly certain it is not bugs, as my other plants seem unaffected, and they are in close (ScrOG) proximity. This plant is a bagseed Sativa that is a little more than 3 weeks into flowering. It has been fed full strength Fox Farm Tiger Bloom alternating with molasses. I pH my water at 6.0. I also tested the soil pH with a soil test kit and it is in the low 6s as well. The medium is Smith & Hawken Premium Potting soil, which may or may not just be Miracle Grow Organic. They also have Bat Guano mixed in the soil after the last repot. Can anyone tell me what it is? Is it Mg deficiency? Thanks in advance.

S-Town

Are those mites that I see on your first photo? Those tiny sand yellowing dots on those leaves???

stop adjusting the ph of your water. looks as if you have calcium lockout due to low ph. flush once really well.