Dusty Kiefers
Well-Known Member
Your perlite also looks yellow. Are you useing r/o water & are you using anything other than water?
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Is your tap water alkiline or above 7.5 in p.h.
Do you have drain holes on your solo cups?
I would also check the p.h. . Drops work o.k. if you dont want to get a meter.
Peace love and happy growing.