Curled brown leaf tips

Exodus79

Member
Hey now. I’ve check my plant this morning and seen that my leaves have curled brown tips. I’ve check my ppm and it’s 400. Did a res change last Friday and been adding water only, and I bit of hydroguard as well. Temps sits around 18c. What do you guys think. ? I’m at my 5th week of flowering. Expect is 9-10 flowering stage
 

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