Bluelab PENGTB Grower's Toolbox with pH Pen, Conductivity Pen and Probe Care Kits https://www.amazon.com/dp/B00H90O26C/ref=cm_sw_r_cp_api_i_M-LrFbTM2RK5P how about this?
Um I do t go by the bottle I go by the feeding chart... and it was about week 4/5ish which is 3tsp aka 15 ml of bloom 2tsp of grow big aka 10 ml and 2tsp of tiger bloom aka 10 ml.... I’ve only feed it 2 times Nd that’s what happened....
Last time I did the paper towel way, this time it’s seed in root riot.... that’s why I’m asking about the light.... if anything I’ll take it out the root riot Nd do the paper towel way