Most screens do. Nutrients in the water are higher when the screen is "fresh", but as the screen grows, nutrients in the water are reduced, thus allowing greener growth.
I have noticed a slight increase in N and P, when I have just cleaned the screen. This lasts about 4 days until the growth kicks in again. My confusion arises when the tufts of green algae that are attached to the screen after a clean stay green and do not brown.
Because the are already grown; they are already a particular species. Species don't morph into other species; they stay alive as themselves until they die.
I don't think you could ask for a better looking screen of algae.
Cheers Ace. Got a few "improvements" still going on this screen. Now maybe time to try the wierdest improvement yet. May play some trance music to my screen with some cheap speakers placed next to it;
http://www.oilgae.com/club/users/tomcatino/blogs/1276
"Wan’s team, in fact, found a level of optimum exposure that led to a quadrupling of growth of the biomass, ...."
Just WooooW
You will be first to try it for tank and may be think about undertable fuel plant.
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