Help ! Coco grow calmag or ?

Hello guys , i just want some help figuring this out.. i use canna coco a+b and rizotonic 0.7 ec 5.8 ph, run off 0.6ec and 6.0 ph my temps are around 18-23°c day and yesterday at night temp drop to 14°c for a few hours,too cold i know, my humidity is around 65-85.

How far along? What’s ppm of water? Needs nitrogen. Possible Cal/Mag.

I would up your EC and water less frequent until it has a bigger root mass to cope with more watering more often.
Its not going to hurt to add a cal/mag solution , most coco growers do. I personally don't but always have a bottle available.
When you do water allow plenty of run off.

How often do you feed? When did you start feeding? How old are the plants? What water do you use? Do you ever use plain water? Plants that size in a coco/perlite mix like you have should be fed every day to run off with 1/4 - 1/2 strength nutes, pH'd to 6.0.

coreywebster said:

I would up your EC and water less frequent until it has a bigger root mass to cope with more watering more often.
Its not going to hurt to add a cal/mag solution , most coco growers do. I personally don't but always have a bottle available.
When you do water allow plenty of run off.

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Canna coco a+b is on a 500 scale, isn’t it? I would think 0.7 is fine.

The 3 weeks since the seeds poped out, 0.7 ec its about 350 ppm, they look good 2 days ago, then i water them with 10-20% runoff, i put my heater inside the tent, but have a termostate in it temps dont go higher than 24°. I already can see roots on the bottom. I water them 2/3 times a week

frizfrazjaz said:

Canna coco a+b is on a 500 scale, isn’t it? I would think 0.7 is fine.

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Depends on if its total EC or without the tap EC added, not sure on the scale, I just use the chart but not at full strength
http://www.canna-uk.com/growguide

Just look very pale and overwatered. Hence the suggestion.

My water is r.o water. Now black dots are on the leaves :/ i water them too mutch is that it ?

Green.Lady said:

My water is r.o water. Now black dots are on the leaves :/ i water them too mutch is that it ?

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My water is basically ro. ppm around 20. I add Cal/mag every watering to 125-150 ppm, before nutes. Turned my plants around

Green.Lady said:

My water is r.o water. Now black dots are on the leaves :/ i water them too mutch is that it ?

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Canna nutrients are specifically designed to be used with tap water, since us Europeans have great tap water mostly.
So defo add some cal/mag

I would up the nute strength, add some calmag, and start feeding to run off every day. 2-3 times a week is what you would do in soil, not coco.
Just to give you a comparison, these two plants are 3 weeks old and been fed every day since sprouting.

MickFoster said:

I would up the nute strength, add some calmag, and start feeding to run off every day. 2-3 times a week is what you would do in soil, not coco.
Just to give you a comparison, these two plants are 3 weeks old and been fed every day since sprouting.
View attachment 4073967

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They look nice, i started to water everyday and the leaves drop like in the pic, thats why i stop watering every day, and they stop to do this .. i put the rockwool directly in the coco, that is afecting anything ?

Green.Lady said:

They look nice, i started to water everyday and the leaves drop like in the pic, thats why i stop watering every day, and they stop to do this .. i put the rockwool directly in the coco, that is afecting anything ?

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What is your coco/perlite ratio and do you have plenty of drain holes in the bottom?

@MickFoster i have 10% perlite and yes holes on the bottom