copper spots dried leaves

Hello everyone Need some assistance in a diagnosis of my plant. Im 48 days into flowering on a 55 day strain. Im using a 5 gallon dwc ,600w hps cool hood, gh nutes

I did have a ph issue for a little bit when the ph was around 5.3 but now it is at 6.1
I started to notice today when I touched the leaves it was dry and broke off. I have a few ideas on to what the issue is but I would like some input thanks

Looks like cal/mag or maybe bugs.

The little white specs looks a bit like spider mite damage and the bigger splotches could be a result of your ph issue which would have locked out some nutes. Crispy leaves usually are too high EC from either too much nutes or hard water.