Can someone please help

Using canna coco. Added perlite.
Temp when light on 75f/79f humidity 50%
When off 67f/69f humidity 50%
Using hid light 400watt
 
Using canna coco. Added perlite.
Temp when light on 75f/79f humidity 50%
When off 67f/69f humidity 50%
Using hid light 400watt
What are you feeding it, how often?
 
Using canna coco. Added perlite.
Temp when light on 75f/79f humidity 50%
When off 67f/69f humidity 50%
Using hid light 400watt
And 67F is a bit low IMO... I wouldn’t let it get any lower.
 
Just water...ph 7
Only when pot gets lighter and knuckle dry. 6ltr pot.
You can’t do that in coco.
You need to be going in at 5.8-6.0, feeding 1/4 strength nutes once or twice daily. Water to runoff each time.
 
Do you have a pH pen? If not, I’d highly recommend one if not. A mL dropper/beaker too.
 
Are they not too far gone
Oh dude, you’re good. They’re just starving. These little things are hardy as hell.
What nutrient line are you running?
 
Do you have a pH pen? If not, I’d highly recommend one if not. A mL dropper/beaker too.

Screenshot_20200413-005457_Samsung Internet.jpg

I have one of these
 
A friend gave me a stick the other day.
It's called a Bluelab Truncheon EC/CF/PPM Meter Hydroponic Nutrient Strength Tester
 
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