is it calcium deficiency?

[nachokiller]

Hello my plants are on flowering phase 5th week and small burnt dots are starting to appear on top leafs, my top leafs also are much darker than the mid bottom ones.
Im not sure if its phosphorous or calcium and i want to double check before before doing something. My medium is hydro dcw, strain is BAD AZZ KUSH, and im using general hydro flora trio drain to waste nutes, with 600w led. Im adding some pics also.
Thanks for the help!!

[Dagmar]

The first pic looks like an insect infestation

[Waltermelon]

Looks like bugs and a deficiency. The reflective spots on the top of the leaves, and the odd looking bud lead me to bugs. The rust color spots says deficiency. But what do we know?

[nachokiller]

Hahaha its not. From what i know calcium appers on the older leaves not the new ones... so what is it?

[Chefbjy]

Yes calcium deficiency will effect lower growth first usually presenting a yellowing look not brown spots. Did you check the ph those problems look like almost anything. Wind burn can also look like deficiency or pests.

[nachokiller]

I lowered my fans speed just in case. Ph is fine. In case its wind burn, does it usually affect the leafs that are under the fan wind? Because the ones affected are not close to the fan.

[Chefbjy]

Do any of them look like they're clawing? Have you used a foliar spray? This is what wind burn can do http://www.growweedeasy.com/cannabis-wind-burn

If you've sprayed them chances are it's a little burn from not drying fast and the light magnified under water spots. Is your light set at a good height?

[nachokiller]

No clawing and i did foliar spray after i saw first sintoms (first night with epsom salt, second water) both times 10 mins before the lights went out. Right now the closest plant to the light is at 16 inches or 40 cm

[Chefbjy]

Mag won't hurt especially if you're not using any.

[OzBud]

How/why are you using drain to waste nutes in a dwc setup?

[OzBud]

Are you using CALiMAGic as well?

[nachokiller]

Easier to follow what nutes are in the mix, once a week or week and a half i prepare each dcw with fresh water and nutes... (i have 8 5 gal buckets im just using 3 because its my first grow). Next one its all 8

Calimagic not yet, today i might

[Chefbjy]

Hmm I didn't notice that, although gh makes drain to waste that you can also use in Coco or hydro. Hopefully following the directions.

[braincrash]

I had a similar issue not too long ago, I also suspected it was a pH issue, or calcium, or even mag def. I grow on coir mix, feeding Advanced Nutrients "Sensi Bloom" and "Big Bud", both from their "pH perfect" line, so being a pH issue wasn't really possible.
Sadly I never quite figured out what caused the problem, I asked around several forums, and all we came up with was the very low RH at the time, combined with light stress and maybe a bit low on iron.
I flushed her good and fed her bat guano enriched humus/compost tea. Afterwards I also added "Sensi cal mag x-tra" once a week, it contains a good amount of chelated iron, ( iron defiency is always a possibility when growing on coco coir, and can show itself in the weirdest ways).
Anyways, after this little tlc, she bounced back and finished off like one of my top ten plants off all time (the strain was Jack Herer)
Best regards, BrainCrash

[Dutchman1]

Could be cal/mag, you said you havent used any.

[gbauto]

Looks like Ca. to me. I have used H Flora trio in my RDWC system for 3 years now and I've ALWAYS run into signs of Ca def. on all of my grows. I would suggest that you use the recirc feed chart-it has higher concentrations to offset using the same solution for 7-10 days. Some type of cal-mag additive will help. Just as an aside-I'm experimenting on a couple of DWC buckets downstairs using Greenleaf Nutrients Megacrop dry nutes. I'm 3 weeks into flower with this stuff and no problems whatsoever-I'm thinking that I may have found a better solution.

[Dutchman1]

Keep us posted gbauto. I just bought a 20lb bag of that stuff. It looks pretty good so I thought id give it a try on my next grow.