New Grower Seedling help please

[ricky2060]

Hi again folks , here is my setup and problem

DWC system , seedling 2 weeks old and yellowing from tip of leaves going inwards , seedling has 2nd true set of leaves and the ppm was at 150 with canna rhyzotonic and canna start , ppm now at 250 after adding canna vega.
small indoor tent .
600w dual spectrum hps air cooled
rez temp is 65 f - 70 f
room temp 70 f - 80 f
ph 5.8 ( had to calibrate ph meter which was 0.4 under , dont know if thats whats caused problem but i calibrate every week )
air flow is good
i have a small plastic dome over netpot to increase humidity ( dont think theres any probs with light getting through ) .
Well hopefully someones had this problem and can help me out

 

[wwwillie]

Hey!
I am not a hydro grower, but looks like you have it down pretty good so far. Maybe the nutrient, vega, but I don't think so at two weeks. What stood out to me was the dome. I used a dome in the beginning of my three girls and they did not like it at all past the first few days after thy popped.
Hopefully a hydro guru will add something
It sound like a sweet well thought out set up I am sure you'll be up and growing her all greed and good in no time.
Peace and happy growing.
:karma Cloud:

 

[ricky2060]

Cheers for input WWW . i was worried about light getting through plastic dome so i cut the top of dome and replaced with cling film ( Saran wrap if your american lol ) . humidity must be high as theres allways condensation inside dome , but there is 2 ventilation slots for air intake.

 

[ricky2060]

8 hrs later ( 4 hrs of which darkness )
after ph meter calibrated and lowered the ppm to 228
plants lookin a little healthier.
dont know if it was because ph was low ( 5.2 - 5.4 ) due to ph meter or ppm ????
think ill calibrate my meter twice a week from now on