I had an idea. Bear with me as I have no knoweldge of plant biology. I was reading about Tom Barr's idea on mega dosing in FINS. Basically, his idea is to dose alot of the NPKs and than perform a LARGE water change 12 hrs later.
I was wondering if this idea coul be modified such that the large dose of NPK's are added during the night. Since plants are higher plants, they are able to store nutients to a much higher capacity and than before your lights turn on do a massive water change to lower the levels to normal. This way the plants will have stored up enough nutrients, while the algae would not be able to store as much. In which case, help the plants outcompete the algae.