My plants have brown tips no matter what i do

Indoor Growing Grow Room
1

what’s wrong with my 1 month old sky walker plant. i feed 2.5 cal mag 2.5 flora series. Growing in coco.image image

2

Looks like nute burn to me. What is your ppm going in? Ppm of your water before nutes?

3

i never checked that, but i use spring water.

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4

Welcome.
Are you checking PH?