no green algae growing?

[Bloodasp]

Alk is slightly low I think. Ca is just ok. Have they been exposed to air?

[Kit with Cat]

Sorry has what been exposed to air?

[doch]

Coraline that gets exposed to air will die and turn white. What kind of rocks... live or dry? I find that the dry rocks seem to take a while to get purple growth... not sure why. The green stuff probably stopped growing due to lack of nutrients... that's a good thing!

[jostafew]

Hey everyone, thought I would follow along, I have a similar problem (very little green algae growth but a fair bit of brown, poor coraline growth)