Light colour with brown spots?

Hey there I know for sure 100% the problem and the solution The soil ph is way to low causing lockout when you water if you collect some of the run off water from the bottom the pot and check the ph it will be down around 5 or below The solution is simple if possible take the plants to the bathtub and run about 5 to 10 gallon of tap water thru the soil most tap water is ph around 7 to 8.5 this schools being up the soil ph and wash out any old nutrients in the soil make sure after running all the tap water thru the soil to water a few cups of water with nutrients after the tap water so the plant has some nutrients to absorb the tap water is just correcting the soil ph so the plant is able to absorb nutrients Good luck if you don’t fix the problem you will start to get more and more of those spots all over the poant