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Two days after solution exchange pH was rising up to 6.7. Corrected to 5.8 with DutchPro pH- (38% nitric acid). I will wait a few days and if the coloring doesn't show more healthy green, i consider adding micronutes with biobizz topmax.
i know its 3 years ago but how did you like the migro light? i just bought the ARAY 4 for a 120cm x 60cm tent and would like some input or maxbe a tip (: