I'm not getting much growth on my screen. I recently changed the screen size from original sizing to the "per feeding size". The growth is very light green, even coloration all throughout. flow is measured and correct. I'm having Cyano and some diatoms. running 18/6 hours. I can scrap after 10 days and get about one handfull of algae from both sides of the screen (definitely not 3d). What should I do?
Size of screen size and bulb configuration is
(4) 23W CFL to a 13.5"W x 9"L (2" is under water)