Rootrot!!

Shit on our beauty has rootrot. Ill post a picture below. So far i've put a fair amount of H2O2 in the container and some directly on the roots.

What else should i be doing and can a plant recover from this?

Thank you inadvance

how low is you waterline in that res? high res temp is #1 root rot cause. sometimes all you need to do is crack the lid twice a day to get some fresh air in the root zone. also with that many plants, how many stones do you have?

the water is about room temp which is 75f.

we have one air stone. its about 8 in long but we should invest in another.