Brown roots after combating larvea with h2o2

[Fro5ty]

I had a larvea infestation. I changed the water, and added h2o2 in the new batch. The larvea turned dark, but some are still alive. But more troubling is the color of my roots. pH also went from 5.5 to 6.9 in a day. Normally it should increased to around 6.0. Water temp is 20celsius. Roots still feel firm.

Is it a lost cause, or still saveble ?

Last photo is from pre-h2o2, first 2 are post-h2o2.

 

[Fro5ty]

I've been thinking about this for a couple of hours. Is the rotting because the larvea? To much h2o2 (doesn't make any sense)? Or because I raised the water, while changing the water?

They really started after adding h2o2