Only a few leaves turning this color, the rest are time. I used a mix of happy frog and ocean spray on bottom. Just entering early flower stage.
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Looks to be a potassium deficiency. Are you feeding nutrients and what is your input PH? That’s a great medium but will need nutrients around week 6. Run off PPMs and PH? 
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Are those bottom leaves? Can you post a pic of the whole plant? It is normal for the lower leaves to develop blemishes and eventually fall off as the plant matures. A support ticket will help us help you.
A support ticket will help us help you. Can you please fill out a support ticket? Please include what type of water you are using (RO, distilled, tap.)
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non-applicable)
• What strain, Seed bank, or bag seed
• Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
Soil brand and type
• Vessels: Pots, Grow beds, Buckets, Troths
• PH of Water, Solution, runoff (if Applicable)
• PPM/TDS or EC of nutrient solution if applicable
• Indoor or Outdoor
• Light system
• Temps; Day, Night
• Humidity; Day, Night
• Ventilation system; Yes, No, Size
• AC, Humidifier, De-humidifier,
• Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture of any issues you may have to allow the community to assist you. Pictures taken under natural or white lighting are by far the best.
Add anything else you feel would help us give you a most informed answer should be included. Feel free to elaborate, but short and to the point questions and facts will help us help you in a more efficient manner.
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That’s probably what it is. I’m going to start nutes with the big bloom fox farm every other day watering for a week or two and switch to the tiger bloom every other feeding. Thanks!
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You’ll need both Growmie, Grow Big and Tiger bloom. The Grow Big has the needed nitrogen and the Tiger bloom has the needed PK. Less nitrogen more PK. I would mix a 1 gallon test batch with 1/4 Big Grow, 1/2 Tiger Bloom and some calmag. Go in with the calmag 1st at 3 ml then the others but dissolve each before adding the other, test your PPMs and PH. Shoot for 1000-1200 PPMs and 6.5 PH. With all this said I would first water only to run off and check those numbers to know how much to feed. Soil likes a wet to dry cycle with feed, water, feed routine and also to run off to adjust each feeding. This is where the watering cycle helps in Between the feed cycle…all about the run off PPMs and PH
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