My jalapeno was starting to get root rot. Hope i can save it

My jalapeno plant was looking a little sad and when I went to change the water I discovered the roots getting brown. I trimmed half the roots and also the top because it was getting too full and heavy. I got more than 20 small peppers. I cleaned the container and put new nutrients with a little hydrogen peroxide. I also cleaned my tent and changed the water on all my plants. the other plants have nice white roots. I hope the jalapeno makes it because its almost time to take it outside. ( Kratky peppers maxibloom mars hydro )