Need help identifying problem

• Problems, Pests & Disease Control

Need help diagnosing issues

• Thread starterTriple R
• Start dateYesterday at 4:12 PM
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Yesterday at 4:12 PM

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Triple R
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I have 2 white widow Auto flowers week 2 of flower. In coco/pearlite 3 gallon fabric pits. Mars hydro tsl 2000. 24 light cycle started seeds in pots temps a lil warm from 79-84°f. 50% rh. Smaller one green and healthy. Bigger one is getting issues, leaves turning yellow with brown spots curling tips. Feeding with humbolts call/mag plus iron and GH trio about 3 ml each per gallon. Need help identifing what's wrong with her. Nitrogen? Potassium? Only my 4th indoor grow and I'm still learning. Many years gorilla grows in woods never had issues. Just plant in spring harvest in fall. Nothing in between. First pic is the small one. Rest are large one with issues. Anyone with indoor exp. Help please

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Potassium.

I was leaning that way. I ran out of cal mag about 10 days ago. Got cought sleeping. Just got humbolts call mag plus iron 2 days ago. Seems like it's starting to come around. Time will tell.