3rd week into growng and the leaves are showing a sign of something and Im not sure what to make of it. Growing in FF Coco loco, worm castings and fox farm happy frog. 1 tsp. Of Calmag every watering with worm tea. Ph at 6.5.
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Welcome to the forum.
Unfortunately I’ve no experience with the coco-loco soil.
I’m mostly a hydroponics guy 
But there’s many here that can help and they going to ask for pictures if you possibly could provide some.
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@Smoker61 …welcome to the Forum. Please post a pic and we will do our best to help you out.
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Welcome to the neighborhood. Is it just that one leaf? It looks like it could be a blemish and not a deficiency. Your plant looks good. 
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2 separate plants. Just on a couple of leaves.
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Agree…just a blemish…otherwise the leaves look healthy
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Thank you for all the help. Im still green at growing indoors.
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I run coco loco quite often Grow Bro, your plants are looking nice and healthy. Start a feeding routine of 800-900 PPMs with a PH of 6.3-6.8 at the end of week 4. The amended nutrients will be spent by week 4. I would suggest with using just the coconut loco on the your next run, drains and a lighter consistency than Happy Frog 
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Are those in autopots or some other kinda
watering trays 
They look very good btw 
well done.
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3 gal Auto Pots with air domes.
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My recommendation, just a lil something that I like so far. Take a 3 to 1 mix of Fox Farm Coco Loco to FF Ocean Forrest. Use that as the first half of your final pots medium. Then add on TOP, not blended, Fox Farm Happy Frog. As the root system develops it gets the higher NPK from the bottom, as it has been established in the Happy Frog.
Use whatever nutes you KNOW how to use.
I recommend, for Automatic Flower plants, Fox Farm Grow Big, Big Bloom, Tiger Bloom, and Bushy Doctor Cal Mag. Distilled water only. Use 1/4 recommended dose on Auto. Honestly, the medium will carry the plant into Pre flower. No nutes during veg but cal mag.
pH at 6.4-6.7.
If you’re growing a Photo Period strain, then I love love love Flying Skull line nutrients. They made my garden blow up. Dense nugs. Terps were cranked up.
Great weed man.
Keep on growing man and you’ll learn the little things to keep it healthy.
Buy good meters to. TDS, PPFD, PPM, ETC.
ENJOY THE GARDEN GAME!!!
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I had that happen in an indoor grow once. It went away. I think I accidentally fed a plant too much nitrogen or something. Can’t remember exactly. Probably the amnesia weed I’ve been growing😂
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Welcome to the forum @SpaceyX!
Looks like possible lensing from water droplets. Rest of the plant(s) look real good. Glad to see someone using the correct ph for coco loco. A lot of people ph it as if it’s coco.
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Definitely looks great, those yellow splotches could be from water drops left on leaves, or a slightly too high ppm.
I wouldn’t worry too much though, those ladies are supple and vibrant!