seedlings underside of leaf darkening

[rupy]

Hi Guys

I have three seedlings 11 days old they have been in propagator for 11 days humidity 80 and temps between 20 and 23 max mainly 20. I have noticed the underside of the leafs on all of them are turning dark and on one it is showing on the top of the leaves.
I have kept ph at about 6.2 though it did go over 7 when i added rhizo and forgot to ph down anyone any ideas please.

 

[chairroller]

It's darker because it's a big cooler than it should be ! 20°C isn't good for 'em, they gonna be less soft (you will notice if you touched the leaves before and after !) and that's wat gives them the dark colour !!

 

[chairroller]

Hi Guys

I have three seedlings 11 days old they have been in propagator for 11 days humidity 80 and temps between 20 and 23 max mainly 20. I have noticed the underside of the leafs on all of them are turning dark and on one it is showing on the top of the leaves.
I have kept ph at about 6.2 though it did go over 7 when i added rhizo and forgot to ph down anyone any ideas please.

With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.