I had been hearing about the use of Hydrogen Peroxide as a way to deal with pest algae, so I figured that I would give it a try. I had a nasty case of bryopsis and had tried everything you can imagine to beat it. I tried new bulbs, nudibranchs, chaeto, a seahare (RIP), Tech-M, new RO filter.   I can tell you that I am a firm believer in H2O2!!! This is how it went down.   I was really nervous about dosing my whole tank, so I started small. I started by taking out a small rock without cor