Join Date: Jul 2013
Location: Chilliwack, Canada
not going to say this is definitive, ... i came across one source that stated green spot algae does better in phosphate deficient environments, ...
if that plant (i suck at identifying plants), is naturally yellowish then things are good, ... as i'm dealing with an iron deficiency my plants are all going pale & yellowish
as odd as this sounds, ... stopping your CO2 would slow plant growth and metabolism down, giving you the symptoms of the plants doing better if you are dealing with nutrient deficiencies. as the plants aren't using nutrients as quickly more nutrients are available for everything.