Spots of concern on leaves, any advice?

This is going to be the first stages of a calcium deficiency my friend, the main symptom that you’ll be able to notice is brown or bronze splotches or spots on your leaves are showing. This normally happens because your ph is off but yours seems spot on, this also happens from using filtered or reverse osmosis (RO) water to feed plants the amount of calcium found in tap water varies, but some tap water has enough calcium to prevent calcium deficiencies, giving too much potassium can also sometimes cause the appearance of a calcium deficiency, this can also happen when you just don't give the plant any type of Calcium supplement(Cal-Mag).