Welcome to APC, sound like a nice setup you have going there.
From reading your posts I am thinking you want to take a multi-pronged approach. First off the CO2 level needs to come up, increasing the flow thru the reactor as well as turning up the amount of CO2 added should help in that. You also need to start doing fertilizers in an effort to have the plants out compete the algae for the nutrients.
There are lots of posts on how to fertilize effectively.
From reading your posts I am thinking you want to take a multi-pronged approach. First off the CO2 level needs to come up, increasing the flow thru the reactor as well as turning up the amount of CO2 added should help in that. You also need to start doing fertilizers in an effort to have the plants out compete the algae for the nutrients.
There are lots of posts on how to fertilize effectively.