Hi, I can't seem to access the really good info on algae on this forum hence making my own thread. I am struggling with hair algae. Just started injecting Co2 and algae pops up. Why would that be? I thought Co2 was supposed to keep algae away. I am running 4 HO fluros in a 300L tank around 66cm deep. co2 is around 15mg/L as I don't want to shock my fish as I'm trying to acclimitise them slowly Do you think my Co2 levels are causing the algae? Why would I not struggle with algae before Co2 and now I am???