The tank has just about finished cycling. I cleaned the screen once prior. It was just a brown film algae with some small green patches. This is a pic of the first meaningful screen cleaning. You'll notice the center of the screen is not where the real green stuff wants to grow. Can this be due to the leds being too strong and focused in this area? The better growth is above and below where the light hits directly. Do the leds need to be further from the screen? Presently they're 1.5" from the screen surface. These are the "puck" style leds with 4 diodes per puck. They're not supposed to be very powerful, but maybe they're more than enough