Please help!! This is my prize Gelato.
A picture of the overall picture of plant in normal light would be helpful as well. @coolhandact
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA
Strain; Type, Bag seed, or NA
Soil in pots, Hydroponic, or Coco?
System type?
PH of runoff or solution in reservoir?
What is strength of nutrient mix? EC, or TDS
Indoor or Outdoor
Light system, size?
Temps; Day, Night
Humidity; Day, Night
Ventilation system; Yes, No, Size
AC, Humidifier, De-humidifier,
Co2; Yes, No
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you smile.
@Myfriendis410 @dbrn32 @MattyBear
Just in case I’m not around after the info is posted.
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These may be helpful. As @Covertgrower has said; please give us more info and help us help you. It could also be over/under watering or lighting causing the problem.
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Your ph is really low if you’re growing in soil. Soil ph should be between 6-7 with optimal range of 6.3-6.8. If you’re growing in coco or hydro, you would be ok with that ph, but not optimal for soil 
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OK, I’ll push up the Ph. Do you think Cal/Mag is needed?
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Concur on pH. What soil and nute regimen are you using?
It doesn’t look like a cal/mag issue, though cal/mag may be locked out at that pH. Adding cal/mag at that pH won’t help even if it were the issue.
Kelp can help if it is a zinc issue, and it appears it may be that.
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Normal planting soil with Gerneral Organics Gro Box.
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I’d get your pH corrected first and see how it goes.
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Looks like everyone has you covered. Happy growing!