EC input/output problem

Hey all,
In week 3 of veg, I have two Chemdawgs and a Gelato in a 3x3 tent, under 300w Cree LEDs, in Coco using the Cana Coco nutes hand watered mixed in a common tank.
( Tap water w/ air stone agitation, and Ph 6 - 6.8 )

The issue:
Each plant is giving different EC outputs in the run off.
Gelato is within +200 microsesmens but looks the most deficient in the tent.
Chemdawg #1 was -200 and, #2 healthiest looking was -350 from the input.
I'm trying to understand why these are so different. Same starting coco, same nutes going in.. what am I missing?

I'm assuming since I'm following Cana's feed chart that this deficiency will clear up once I figure out this issue.
Thanks.

Looks like it may be a lack of ca and/or mg. Coco can suck some of the CA, leaving less for the plant.
But I qualify....I'm not familiar with Canna nutes.

I do coco - keep my Ph at 5.9 thru 6.2. Feed around 600ppm 1.2 ec in veg. I have to add extra cal/mag to my Jacks recipe, otherwise I get defs. Under CMH/COBS.


My fav.

You can probably knock off a 3rd of what canna suggest on the feed chart, but yeah, get your PH in line, your making calcium uptake harder and if that doesn't stop the issue getting worse add some cal/mag to your feed.

As the plant/roots dry back salts are left behind raising the ec of first runoff.Youll find if you water more frequently the ec will be more like what your pouring in.My.02 anyway.

Was your coco washed / buffered? Are you allowing your pots to dry out between feeds? 5.8 pH is your sweet spot when growing in coco.

CannaCountry said:

Was your coco washed / buffered? Are you allowing your pots to dry out between feeds? 5.8 pH is your sweet spot when growing in coco.

Click to expand...

Yes, it was buffered. I have been following the coco guide that Tint Eastwood mentioned in his post and watering daily per that guide.