First time

This week a lot of problems poped up for me one being the pH of my nutes after being mixed and of my water from source my souls pH has gone to 6.5 from 5.6 yesterday how could I solve this ?? And there is a almost burning look on the leaves I'm wondering is the led too close? Or are the spots where water has been and subsequently burnt the leaf idk could someone please get in touch I have 5 chocolate skunk seeds waiting to go for practice (btw this plant was passed to me along with a light by a mate of mine who had it in a freezing outhouse for two weeks prior to giving it me it was still a seedling 2 week in an he planted it in a small pot so I decided to leave it in there 🤨 ) any comments or thoughts and ideas for improvement would be much appreciated 🕵️‍♂️