need experienced hydro/aero grower for knowledge

ok so i have a sog aero system on 4x8 tables the strain i green crack the crop was fine till the start of week 5 then the hairs turned brown then the plant got some black leaves and some cupping and curing leaves as well im in week six now and ive been pulling out my hair trying to figure it out what ive realized underneath the tops i have green algae and some black shit not sure if its mold or black algae and my roots arent as white as they used to be so i come to the conclusion i have a fungas/algae problem so i flushed with hyd peroxide and am now adding small amounts daily to kill the bacteria under my table tops now is this the only thing that can be done? has anyone else had this prob before??

i have had root rot lol. goto your hydro store and pick up some stuff for your plants roots. cannazym is awesome, might turn those roots around. also dont use cannazyme with hydrogen peroxide they will clash