I have read conflicting theories about this and I was wondering if anyone really knows the answer. Do I need to worry about making sure that phosphate is the limiting factor or not? I have both green dust algae and green spot algae in one tank right now which is what got me thinking about whether I should slack back on phosphate in that tank. But then of course my plants are already hurting from the gsa, I don't want to do anything that will make things worse either. I especially don't want to get into bga territory again, I wiped out a whole tank of plants before and literally can't afford to kill anything else.