that is a nice doggie! Nice to meet you
yes this works on red wiry algae that was what was wrecking my tank. usually multiple treatments are required to beat it back permanently. this algae takes several days after treatment to die off, and its possible it wont die off in the way you treated it due to being too diluted...the peroxide
this type of algae requires direct undiluted application to work, and then afterwards the dieoff takes about six days. you know it worked when the algae target starts to turn bright pink, that means its dying. that happens by the third day, if your application was strong enough and long enough.
you lost zero bacteria during your treatment, it will not affect anything in any dose. peroxide is a weak antibiotic its commonly thought to kill filtration bacteria in our tanks and it does not. so you are good there
you would lift out any rocks that has it on there, and apply peroxide from a new bottle right on the wiry algae tufts, outside the tank. leave the rock sitting on a towel for 3 mins while its soaking in. all corals you have will tolerate a 3 min emersion just fine, sometimes I leave my tank drained for 20 minutes with about 10x that much coral from varied species.
you rinse off the spot after it has sat, and place rock back in tank. algae turns bright pink in about 3-4 days, dead white in a week or two, then if any comes back in a few weeks you just retreat. it took about two years of treating every 3-4 mos to wipe this algae out of my tank. post pics along the way and thanks for joining reefcentral!