Haven’t been able to find some answers to some worries about that approach.
I have two structures I can’t remove.
How long does the peroxide stay in your water chemistry?
And
Haven’t seen anyone chime in long measure of time after treating to report overall tank health.
Too update the situation to help others. I drained tank down until water level was under the part of the affected rock. Dose 3% peroxide to the gha area and most instantly released. Placed a container underneath to catch the run off. Cleaned off what I could. The Rock sponges up a lot I’m guessinf as the Shrimp walked around drunk that night.
Next morning shrimp and two snails dead. Haven’t seen other livestock other than my two clowns that are acting odd. But they are clowns so who knows.
What GHA that didn’t instantly release has turned white and I’ll pick it off when I get home. Draining the tank and throwing the water back in kicked up quite the bit of sand so will post a shot today after work