HELP first timer..Waterfarm with Solarflare

Hi Guys,

I need help, its my first grow and i went all out and got two waterfarms and a solarflare led, but I'm only running one farm first go. My plant is now 20 days from seed and was germinated in rockwool and placed in the waterfarm about 16 days ago. My plant is Northern Lights and is extremely short, has barely cleared the top of the farm. At first my ph was high at about 6.5 but i corrected after the first day and its been pretty steady around 5.8-6. Been feeding her pretty low dose of nutes, GH series - about 700ppm the past 5 days. It should be noted, i saw this start before the nutes and the LED has been moved 22 inches away and its still occuring. Also, my water had a natural 85ppm but what is all that build up on tubing already? These were brand new farms and have been on for 16 days...

HELP

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