4th week in flowering. brown spots, dead tissue and curling leafes..

Hello im having some problems and i need some help... I appreciate any info.

if you want answers and help. we need more info and how about a picture too?

dude go read the stickies

This is four and a half weeks into flowering. I just got some calmag today,havent given them it yet though.

You giving them hydrogen peroxide? Looks like peroxide burn.

No way. Distilled water.. I dont know whats wrong