Wow. I didn't expect that, though I couldn't believe it was algae either. I must have an army of caterpillars up in that Oak, that picture was taken this morning, roughly 20 hrs. after I had vacuumed yesterday morning.
We just had our Kleen Machine do its job, I know, overkill for a AG vinyl, but one less job we gotta do, and trust me keeping this puppy clean is more than a daily thing, since its directly under an Oak and a few feet away from a Magnolia, and there is barely any in the pool today. Now that we think about it with the wife, we pick out at least one or two caterpillars out of the skimmer or Kleen Machine on a daily basis...
I guess they've either been all eaten up by a flock of birds or moved to the other side of the tree or went into cocoon stage, since I took the pics, there hasn't been anymore show up, here and there one or two but nothing like the past 2 days.
Good thing I decided to post finally, we were getting desperate and were going to go buy some algecide.
Anyways thanks a ton. I knew this forum was worth it!!!!