Need some help asap my babies are hurting

sup guys Day 27 all autoflowers all around 650ppm ph 5.8 eating daily I do a Rez change every Sunday using distilled water

What is going on this shit is spreading and spreading fast only affects 3 out of the 5 starts at the tips

Roots are perfect nice white tons of growth light tan from GH nutes currently running 0-6-12
 

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sup guys Day 27 all autoflowers all around 650ppm ph 5.8 eating daily I do a Rez change every Sunday using distilled water

What is going on this shit is spreading and spreading fast only affects 3 out of the 5 starts at the tips

Roots are perfect nice white tons of growth light tan from GH nutes currently running 0-6-12
this is your problem, distilled is not good for growing, it pulls minerals to replace what was removed. r/o is ok as long as your nutes have enough cal/mag in the base.
 
Yup, magnesium deficiency starts on oldest leaves while calcium deficiency starts on newest leaves. So a magnesium deficiency is a good bet. Gotta add that cal/mag!
 
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