All I want to know is whats going on!

[Hank]

Couldn't resist using a quote from a drunk buddy who was waiting on a bunch of us to leave for party.
Away to the problem at hand. This is my 4th grow but my first using Coco. I decided since it was my first I would use the Canna line of products and follow their schedule. I was initially worried that the schedule did not include the addition of Cal/Mag, so I contacted Canna with my concerns explaining that I only use RO water.
I was assured this would not be a problem, all I had to do was add enough of my well water (before the softener) to bring the EC up to 0.2 and that would take care of the Cal/Mag.
So here I am at day 21 in the tent and starting to have problems that look like Cal/Mag deficiencies.
Here is some more back ground information:
I'm using a 5x5 Gorilla grow tent with a Gavita Pro 1000 DE fixture
Temp with the light on is around 25C and RH 23 to 27% (I know its low but I have done very well on a previous grow with the same) The light is set at 1000 watts and is at the top of the tent
Chronic feminized serious seeds, 5 plants in total
Straight canna coco coir in 23 L pots
I hand water with a minimum 20% runoff

This is the canna schedule for my last watering with 37L in the nutrient mixing tank @ 0.2 EC as recommended. Never used all of the 37L had 7 L left over.

85 ml A
85 ml B
74 ml Rhizotonic
93 ml Cannazym
Final EC of 1.3
pH 5.9

So I think its either over feeding or a Cal/Mag def. but I don't know for sure. The leaves are curling with spots of yellowing plus they seem to be drying out to point they crumble.
Not sure how to proceed I was thinking dropping the EC down to 1.0 and adding some Bontanicare Cal/Mag Plus. Maybe drop the pH down to 5.7.
Appreciate the help.

 

[Theoneandonly Z]

Use straight ro with camg. I wouldn't add h2o from ur well to ur ro water as a camg supplement. Well water could be an issue as it can contain an abundance of metals. No camg can be an issue as u are growing in coco which tends to grab camg. Ur Gavita 1000w is over kill for a plant that size. Dim it down to its lowest setting and keep it 24"s above top of plant

 

[Hank]

The light is actually quite high above the plants but you might be right, it could be over saturating them especially at 18hrs. I have yoyo's I can get closer and drop to 600w.
What do think about Botanicare plus for Cal/Mag? I have been using for my other grows.

 

[PButter]

Did you 'precharge' your coco with calcium? Read up on 'CEC of coco'. Or don't... coco grabs calcium up. Look for a product that can be used as an alone for precharging coco.

How high is light? What are leaf temps? could be two of three probs?

 

[Hank]

No Canna doesn't recommend pre charging their coco. I can check the leaf temp tomorrow, I have a laser temp gun but I don't think its too high. The light is 5 feet above the plants.

 

[Gamrstwin36]

Don't Believe Da Hype!! PRECHARGE that canna . Trust ME, your plants will thank you. . Z's right on, might wanna hang that hi powered ballast / light way HIGH. Unless you run a few more plants to SOG IT! Hows that ballast anyways? Was thinking of that brand!

 

[Hank]

The light is already 5 ft above the plants but I think I will take Z's advice and lower the wattage and lower the light as suggested.
Should I give it a shot of Cal/Mag plus right away?
The light is great, supper bright and compact. My first grow was my best using canna Terra nutrients and B'Cuzz soiless with serious seeds 5 plants all together and just over 32 oz. Nothing but trouble since!

 

[Hank]

Sent off an email to Canna explaining my problem, I'm curious as to what their course of action will be. I getting ready to water just waiting on my RO for enough water. I figure a lighter EC of fertilizer along with the max dosage of Bontanicare Cal/Mag Pro.
Just took these pics some are with a flash and one is in the tent.

 

[Seamaiden]

I've never seen it in a plant this young, but that's looking like a Ca- to me. You can also give Ca via foliar feeding.