I have had mine running for a week and no traces of algae (freshwater).  I have high nitrites and nitrates as it is a test tank with goldfish.  I don't think it needs to fully cycle before growing algae.  I used fiberglass screen for the scrubber.  It is the same screen that goes on the outside of windows to keep bugs out while leaving the window open.  I sand papered the screen a little, but not much as it has plenty of places for algae to grow.  Do you think fiberglass is too slippery for the algae?
				
			
	
	

