Although black slime absorbs the most nutrients from the water
(see http://algaescrubber.net/forums/show...he-best-filter)
it can cover up weak LED lights easily. But the strong 660nm deep red LED lights in
DROP scrubbers® cut through the slime to enable growth on the other side of the box.
This SURF8 or 8x scrubber® has dark slimey strings in both compartments. This is from saltwater (strings are best for salt) and shows how the dark slime is only on the Green Grabber® strings, and not the rocky side walls. Some growth just prefers strings, and some prefers rocky walls; none of this growth would hold on to a waterfall screen very well, however.
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