It's a Hanna 3 in 1 !! taking reading's from my controler resevoir, PH is 5.8 !! and i'm using GH 3 part but only using Micro and Bloom 1 part Micro 1.5 part Bloom, 5 ml of bleach every 4,5 days per 35 gallon !! It's only the tips of the leaves tho, i'm sure it's ok to have a little bit of burn !!