White Rhino && Big Bud

I've had some similar issues to you (no rain, very dry for a looong time, tap water in a mining area). *Kinda* looks like minor signs of magnesium/calcium imbalance (too much magnesium/too little calcium, or something else interfering there, possibly fluoride and such, might even need a tiny bit of boron). Otherwise looks really good though. I'd probably think of lowering whatever nutrients contribute the most magnesium a bit and possibly increasing calcium a bit, but I'm just guessing. For one plant that had severe issues that *I think* is related to magnesium, but not only, adding some sugars/carbs/acidic stuff seemed to help quite a bit. Very tentative speculation though, so I'm not suggesting much/if any changes. Good luck!