Well horizontal screen are difficult at best to make work. I have read much about them and there are a few over on algaescrubber.net that have made them after much experimentation regarding how to make them work, and the bottom line is that they are just inherently inferior to vertical scrubbers or even UASs.
Also the LED
light that you are using is probably not the best for an algae scrubber. LED
) ratings are meaningless for scrubbers, they are only provided for acrhitectural lighting when trying to achieve comparable look and feel of light color to MH
or fluorescent sources. For algae you need a lot of red, and CFLs @ 2700K provide this. For LEDs you need a plant-growth specific wavelength, and that is 660nm. So your scrubber may grow OK eventually, but it will never really have that good of a filtration capacity.
Also, you need to have patience when it comes to growth. In FW
, scrubbers start much faster - in just days. in SW
, it takes weeks, up to 6, and that is under proper lighting and flow.