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A question of topping and leaf curl

Hi All,
 
A few questions if I may..
 
My Jalepeno plants have been in my hydroponic set up (Airated DWC) for 3 weeks. They are coming on very well (I think).
 
My first question is regarding when to top the plants.
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For reference this one is 5.5inches tall and has a few sets of true leaves.
Any advice appreciated as YouTube has many different opinions.
 
Secondly as you can see from the pictures some of the leaves are curling down. Any ideas on what might be causing this and what to do about it?
 
The lights (3500k LED) run on a 18/6 cycle. The temperature is maintained at 83F during the light on period and 75F during the light off period.
The humidity is controlled between 60% and 75% RH.
pH around 6. Using chilli focus at around 650ppm for the nutes.
As the tent is not continuously vented to/from the room I have a yeast/sugar bottle producing CO2 to make sure there is sufficient available.
 
Any help/suggestions/comments appreciated.
 
Paul.
 
 
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