Green Hair Algea! Hey guys (n gals) - I am a newbie here at R2R and as of Jan. I am a reborn again reefer, having a 30 Gl and a 200 Gl back in the mid 90's which I had to give up. So in Feb. I started a Pico Tank 2.5 Gl - Live Rock and Sand with Ocean Water, I was good to go from day 1 ~ I ordered the HOB and a Heater and the HOB within hours turned into an SOB! It faulted and the temp in the tank became 101 I then had a problem with Green Hair Algea, so I saw that BRS recommended Hydrogen Peroxide They say after using the spray technique no corals or fish were affected. So I decided to use my own technique (trailblazer me-LOL) I poured 3 capfulls into the tank (1- 3/4 Gl) and within hours to my surprise I watched more than half the rock turn a deep Purple! The Algea went away, but then I had an outbreak of Aptasia - and a Peppermint Shrimp got his belly full.....