I have a mantis shrimp tank which had a pretty bad outbreak of green hair algae in it's early stages. The tank is about 6 months old now and I've mostly gotten the algae under control through regular scrubbing with a toothbrush, phosphate control with GFO and a dose of Flux RX at one point. The main aquascape is in pretty good shape at this point, but I have about 40 pieces of rock rubble / coral skeleton scattered around the sandbed which the mantis shrimp uses as building material to cover the entrances of her burrow. Every 2-3 weeks I'm still having to remove every piece of that rock rubble and scrub with a toothbrush in tank water during a water change just to keep the GHA from getting out of control again, which is fine, but I wondered if I might be able to rid those rocks of the remaining GHA by dipping them in hydrogen peroxide or something similar? I know it won't necessarily be a long term fix as any remnants of the algae on the main aquascape will eventually find it's way back onto these rocks, but if I could reduce the tedious work of scrubbing dozens of small rocks every couple of weeks, I'd be happy.