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I wanted to update on this. For the rock that I pulled out, all the algae that I doused in hydrogen peroxide made a full recovery and back to its natural healthy burgundy color. It had originally started to whiten and looked like it was going to die - nope.
Naturally, the rock that was simply put in tank water for 72 hours with a small dose of hydrogen peroxide showed no signs of any harm to the algae.
=(
Means the only way this is coming out is either another round with more concentrated peroxide, or more scraping it off the rocks.
@brandon429
what does of hydrogen peroxide did you use