2 plants in aerogarden led 70w

My humidity was really low in the low 30s couldn't get it up not the plants really showing problem i researched and come to terms i need a proper air pump so changed that and decided to to 5x50cm led 5050 red/blue 5-1 as side lights looked at the root zone dr feel good has the dreaded root rot so i pulled res out of grow box took it to my wash basin washed both plants roots with straight tap water lol and used hydrogen peroxide for a hour in tank there was lots of crap buildup disgusting but the damage was done i started looking into different feeds for the following week i orderd ph pen ppm pen and a/n micro grow bloom but still used citric acid for ph down when checked 1st my ph was 7-8ph that highso used citric acid to bring it down which was a waste kept it down only for short periods invested in ph down later