New Grower How tall should my plants be

Thank you I will try and take some pics with the lights out and right way around buts it's a dark hole in that tent and auto pots sit in a tray with there food so drip every where when moved. all 5 led''s are now sitting 90 cm or 3 foot above lesson learned there let's hope they stretch I'm used to keeping them short and bushy then switching to 12/12 with photos and leaving them stretch so school boy error there lucky enough the ultimate in there are 3 wks old just the extreme at 5/6 wks would take hit there true potential
 
My ec is on 1.2 started 0.8 then 1.0 and now 1.2 growing in 60/40 coco pebbles at what point should I up this strength to get the best out of what I've got and many thanks for your time and giving me guidence
 
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