That is one beautiful plant. And it looks well on its way...I know you mentioned using the alga grow as a Foliar spray, but it might be more advantageous to use the alga bloom for your Foliar spray...you can use with the grow but I believe the alga bloom should become part of your schedule and would pay off more. But yes a Foliar alga grow would be good too. Plagron says to use it at every watering, however I agree that doing it only a couple times a week should be good.
The plant really does look outstanding, keep up the beautiful work.