How well things are going? Just curious.
Instead of using peroxide, you can spot treat the plants with the Carbon supplement you use. Rivercats mentions Excel complete or whatever it is, in my area it's called Easy Carbo. In my adventures with BBA, I used that instead of H2O2 to spot treat which worked just was well without the possible damage to the fish. Just use your normal about of liquid Carbon and use a droplet pipette to put it in affective area.