So I had done the H2O2 test to see if what I has was cyano, it turned pink. I dosed 30ml peroxide 3% to my system twice a day. After one week I did not see any difference. My system is about 280-300 gallons, bare bottom, small amount of detritus in tank. Running calcium reactor, GFO, Reef Dynamics INS-450 skimmer, 2-Atlantik V2.1b led fixtures, recently added DIY Chaeto reactor, Sulfur reactor (still cycling), 4-jebao WP-60 wave pumps. DKH 9, calcium 450, Salinity 1.027, Temp 80 degrees F, PH 7.96-8.02, Phosphates read 0.00 Hana, Nitrates 2 Salifert. Some I can siphon out with the detritus but on the rocks some is in areas hard to reach with siphon. Since the peroxide did nothing before, I left it alone for a week just blowing it off and I am not up to siphoning out every single day physically. I had a mat that I got out last night put into white cup with some RO water. The water turned pink before I even added the peroxide. Added peroxide and this morning only about 8 hours later water was not pink but light red, cyano was floating just below surface and was green in color. @twilliard and anyone else what is max dose of peroxide I can safely use with peppermint shrimp and fish. I am looking for any help before I try Chemi-clean or red slime remover, (which one is preferred and why).