What Can be Wrong??

Hi guys so i have these weird marks on my leaves and i got no idea what it could be.. its a master kush 4th week.. im currently giving him 1,4ml sensi bloom and 1ml cal-mag
ph to 6.5 and 6.0 on the bottom after watering, plant is under mars hydro 98 in coco pro, i dont know if its just a natural reaction because i slightly damaged the leaf or what.. he also has some weird burns on his other leaf i am a noobie and i dont know if i should worry or not ;_;

(I also have astroflower,b52, and organic fish mix by biobizzinfo might be usefull)

I think it's mag deficiency. @hotrodharley Am I right?

Antitheist said:

I think it's mag deficiency. @hotrodharley Am I right?

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It appears likely. I'm unsure on how he's feeding it. The amount of cal mag sounds low offhand.

Also looks light on the N. I would up to 3 mil calmag next feeding or 2 to correct the deficiency then 2 mil calmag every feeding after that. Also drop the ph .2 if you can. When i do a coco run they get 2 mil calmag per gal with every feeding from seed pop to harvest.
Lastly keep that organic fish out of your coco grow.

I would check your potting mix to see how much Mg and Ca it contains. Both elements are important to cannabis and both elements are held up by coco. It appears you could use more Mg.

CannaCountry said:

I would check your potting mix to see how much Mg and Ca it contains. Both elements are important to cannabis and both elements are held up by coco. It appears you could use more Mg.

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He is growi g in coco. Not only does it have nothing, it leaches Ca.

Rapid321 mentions Coco Pro...when I google this, I find it's not 100% Coco and it has added nutrients to it already; this is why I suggested he / she research their potting mix. The point being if the Coco percentage is high enough he needs to consider Mg and Ca...which are held by the coco, not leached.

Just saying guys, i needed more cal mag for sure... btw a little tip, dont ever start off a grow with sensi bloom like master TaNgi did.. feeding..kinda doesn't work the same way like his, not sure why... used exactly the same amount of nutes i had a better light i was growing in coco like he did i was looking at the girls everyday trying to take best care of them, still.. its a hard time to make it work... i think instead of coco its better to use lightmix or mix both i think 20%coco 70% lightmix 10% perlite will work great for my new grow of auto colorado cookies..