Rusty Gold Spots Only On Certain Leaves

Hey guys, first time posting but can't seem to find a good idea on what's going on here. Growing 5 girls in a 6 bucket DWC setup and I'm getting these rusty looking gold spots on 7-10 of my bigger sun leaves. Only seems to have effected a couple of the plants. From what I'm reading I'm wondering if this is a PH or Calmag problem?



Growing in an indoor growing tent under LED's, just switched to Bloom last week. Using Emerald Harvest nutes.

Looks like ph

Starting to doubt myself on the ph thing

Lol
I'm high... ok still thinking ph.
Do you know your ph levels?

SH420

Haha thanks for varifying, after looking around a bit more that's the way I'm leaning too. Was trying to drop my pH a bit so I was between 5.2 -5.8. Keeping it steady at 6 now to see if it clears up.

looks like magnesium to me

maybe some calmag or Epsom