Not a very good photo, pretty sure it's black beard algae... On my plant... Ripped it out of the tank to try get a better photo, doesn't work so well...
Yet to find a way to get rid of this stuff...
Have Siamese flying foxes that apparently eat it, they don't seem to care for it at all...
Looks so ugly and is infesting my tank faster then I can scrub and rip out plants.
Another note, which section of the forum would this go, nutrition/disease? 0.o