Hydro help needed

Hi Guys
This is my first post and although been growing for a couple of years I still have problems.
1,Very little root mat, any theories
2,How long should i leave nutrient pump on (NFT)currently 15mins on 15 off
3,Where can i find correct EC levels for various stages (using Canna)

My set up is as follows:
45 litre NFT
8"inlet running total about 4 hours a day
8"Extraction constant on 20%
16"Ossilating fan constant
Humidity 50 to 60%
Temperature 24 to 27 degrees
microjet pumps with air inlets
600w HPS Shine reflector
Any advise would really be appreciated Thanks

on canna.com u have charts.I´m using them

Hi,

1) I take it you're experiencing slow plant growth too? could be lack of nutrients, could be low oxygen - are any of your roots a tan/brown colour? Are the leaves perfectly green? How old are the plants?

2) Theres no reason, especially once the roots have grown into the spreader matt why you should not have the pump on 24 hours a day? Your water should be oxygenated enough, if not check the res temperature.

3) dont use canna, sorry

Thanks guys,Whats wrong with canna I was using Ionic but recently swapped.Could anyone advise me on a strain for MAX yield Thanks for your help

Yes, whay not canna????

ive been using hessi for yrs there very good and contain the enzymes within, simple and ecconomical when bought in bulk! the supervit is very famous,and withe four components ya have it all. not withstanding that GHE do great nutes as do ionic!,
but i have to agree NOT CANNA!

Hi guys im just about to grow for the first time and i have a few nagging queries, im gonna use an NFT system in my loftspace, as far as i know i am receiving two plants , not seeds . so i am unsure of the light cycle to put it on when i first get it. i dont want to force flowering as i dont want to stress my babies so i was thinkin 18/6 to start off .

1. Do i change lighting to 12/12 once the plant starts to flower
2. i have calculated my nutes , and was wanting to know if i add the flower power and the leaf food at the same time or seperately
3. i am planning to feed the plants on water 2 weeks before harvest, how will i know when this is?

thanks guys this site is gonna get me out my tits hopefully lol:rasta: