LOL I think I'm going to. I found out that the moss I am growing at 6.3 or so has no hair algae, while the moss right next tank over at 7+ has massive amounts.
I started to get black beard, but when I dropped the ph a bit under 6.3 it too went away.
I'm getting tired of throwing away moss due to hair algae infestation, and am thinking if i can put the moss in a ph of 5 or under, perhaps it will kill the hair algae and leave the moss still healthy. Then just reuse it again.