New Grower First grow here please help (Coco + perlite)

[h0w1tw0rk5]

Greetings AFN first post here hope you'll take it easy on me
I've been growing 2 autoflowers berry bomb and THC bomb in a PC growbox from www.mrgrowpro.net with the LED edition 45w.
The plants are really small for being 18 days old and I have calcium deficiency. (I have CAL-MAG on the way)
I grow in 1 gallon smartpots in coco + perlite and I use Canna coco A&B nutrient solution, my ph is between 5.8/6.2 and humidity is between 30/60 % and always over 21C.
I use 1ml per liter of canna a&b (Less is always more I've heard).
And I mix it in a 2L container with 2ml solution.
But my main question is do I feed them 2 liter each everyother (feed - water - feed ) day on the same plant ? So it would be 2 liter in one plant and 2 liter on the other plant ? Cause I've been eye touching it just giving it 1/4 of the feed stressing I would overfeed it.. And this may be the reason it got calcium deficiency cause I've been underfeeding it cause canna coco a&b got calcium and the main things they need but not that much.
Please help

 

[namvet25]

Welcome to AFN.If you could post a picture I could tell much better but cal/mag def doesn't happen until later when they are in flower mode.1/2 the recommended dose should be fine for now at every other water,then when there bigger you can feed at every watering.

 

[h0w1tw0rk5]

Cheers mate, I can post pictures tomorrow I'm not home atm.
But when I do feed them and have a 2 liter bucket of water with 2ml water/nutrient solution do I feed one plant a full 2L cycle ?

 

[h0w1tw0rk5]

I went home fast just to take the pictures hoping I'll get some answers quickly before I do any more damage to them, they are way too small for the age, underdeveloped. I have a 21 X - pro ledlight on the way these 45w leds are weak and bad I can tell...

But here are the pictures hope you can see the small brown spots, it's done with my cellphone and I took many pictures cause 8/10 got blurry...

View attachment 441624 View attachment 441625 View attachment 441626 View attachment 441627 View attachment 441628

 

[h0w1tw0rk5]

Here is a better picture so you could spot the small brown marks, it looks way worse in person, and the pictures in here got zoomed out for a reason it was in a much higher quality on my PC before upload so sorry about that..
Here it is :

So bad quality for the pic upload in here :S
Here is a better one, doubleclick on the picture to get it zoomed in, and again sorry about this..
: http://bildr.no/image/RlI3QzE0.jpeg
And yes I know I got way to much perlites in the medium

 

[namvet25]

What is your input water PH?

 

[KUDO]

what you EC going in and ph they look like could do with more feed,i would have me ph about 5.7,you need to take some test run off too fine out were you are bro,i be around to help if i can,i just lov coco oh yh Hop digity

 

[h0w1tw0rk5]

My water PH is at 7, I live in a town in Norway who claims they got some of the cleanest and best water in the world so that's not a problem. I also let my water stay for 24 hours just to be on the safe side. My runoff is always around 7 for some reason. I am starting to think I'm just underfeeding my plants not in strength but in how much I give them.

 

[WGL]

Good posting. My approach to watering is to use the lift method. If it feels light when you lift it, then it's time to water. If it doesn't feel light, leave it alone. The pics don't show signs of over or under watering but it does look like it needs more light and a touch more nutrients. I also believe in a light touch but try 1.5 ml then 2.0 ml. You are still in the safe zone. Coco growing can be tricky to get used to. Keep posting and asking.

 

[h0w1tw0rk5]

Thanks mate. I am watering it twice a day if I can, atleast once a day since it's a 1 gallon smartpot in coco and perlites.. The drainage is insane and it dries up fast..
How do you feed it ? Do you give it 2 liters of the supplement or just eye catching it like I do ?
I feel like I could do more. I don't know if it's standard to give a plant 2 liters of feed everyother day or not.
I went up a notch on the feeding to test it out, gave it 3.5ml canna a&b in 2 liters. The feeding schedual says 4.5 so i'm still not overdoing it I hope, just giving it a stronger punch hoping it won't burn it.