Black spot on seedling

leblanca

Well-Known Member
Hello, i am growing in rockwool for the first time, i pre soaked my rock wool cube in 5.5ph adjusted water, my ph prtobe was calibrated recently, i feed them currently a seedling nute at 180ppm with RO water. They are under a 100W cob LED that is 24 in from plant, the rockwool cube are in a tray 1/2in over the water, most of the seedling have developped long roots that are in the water.
 

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