Looks as though the growth of algae could be very dependant upon the particular bacterial strains that populate the screen. If correct, perhaps adding a bit of live rock, sand, algae etc to the tank (from a new source) may improve screens that are suffering from wierd growth.
http://www.mendeley.com/research/iso...-green-alga-u/
I add Zeobak to my system two times a week. (Paracoccus Denitrificans.) And the screen on my three month old scrubber has always been freakishly bright yellow. Then could those bacteria be the reason my scrubber never turned green?
No, the reason would be too little N and P delivered to the screen, compared to how much light there is.
More bubbles, more water holes, more distance from the light, and/or less hours will fix it.
Algae contains vitamin B12, algae cannot produce B12, the only organisms that can produce B12 are bacteria.
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