Okay, I figured out my hair algae issue; at least I think I did. The actinic PC bulb is very old you can see by looking at it. This should no longer be an issue since I have a new T5 fixture. I have tried dosing Magnesium but the HA is still around and growing. So tonight a bought a rabbit fish hoping to at least control it. While at the store it was suggested I dose peroxide and recommended 10ml for 75g daily. Claiming that in about 2 weeks the HA will turn white and eventually die. Any thoughts on this approach would be appreciated.