Thanks for the method, I tried it yesterday, and it looks like the BBA is fryed. A few tricks I tried.
You can use a cup to manually create extra flow during the 15 minute H2O2 treatment.
If you take some of your old water out (just clean water off the surface) and set it aside before treating the tank you can 1) increase the effectiveness of your tanks pumps + filters. 2)dilute the H2O2 concentration faster after the treatment, with less of a shock in parameters from a big water change. For example, take 5 gallons out of your 10g, now treat the remaining 5 gallons with 2 tbs H2O2, then after the treatment, take out 2.5 more gallons (discard), leaving one 1tbs worth of H2O2 in the tank. Add the old tank water back, and 2.5 gallons of new water. Gives you the H2O2 dilution post treatment of a 75% water change, while only doing 25%.