Algae and Co2

[csmith]

I understand the relationship between Co2, elevated plant uptake and how this affects algae. My question is, does the algae turn white when it's dying? I have a rock that's covered in algae and a 10 days after introducing DIY Co2 it now has a white tint to it. The GSA on my glass has a few small, grayish streaks through it as well.

 

[dutchy]

Yes, it means that it's dying. It doesn't mean necessarily it will deattach from the surface it's attached to.