v. dipped, dip·ping, dips
1. To plunge briefly into a liquid, as in order to wet, coat, or saturate.
One minute is NOT a Dip. Dip means Dip in the solution, pull it out, move it to the rinse bucket or return to the tank.
Here's a good thread on H2O2 H2O2 dip % ?
My current protocol is to use a spray bottle to mist with H2O2, then either clean water rinse or into the tank, depending on the number of plants and tank size. Dwell time maybe 15 sec for crypts.
Hornwort grows so fast I would just cut away the algae coated areas.