Pic? It might, but I do want to bet its some form of organics building up. Maybe diatoms? Or an algae of some sort. I don't think its possible to ever 100% have an algae free tank, not unless you went super psychotic on the maintenance or something. But I'd assume most "algae-less" tanks are really just 90% algae less....like its always present but it might just be super minute and essentially invisible to the naked eye.
Yea I agree. Its not a big deal on my bushy plants but the lower half of my stems look like crap.
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* http://www.monsterfishkeepers.com/forums/showthread.php?504763-Cheap-plants-less-nitrate!-POTHOS