Re: Wonderful world of Algae......
thedarktitan:
Proper chlorination will keep algae away. I only vacuum my pool when needed. Brushing is once a week or as needed. Was your FC number of 4 tested before or after you added 121 oz of (presumably) 8.25% bleach? That amount of bleach will raise your pool's FC by ~3.2 ppm (guestimating your pool to be ~24,500 gallons assuming 4 foot depth). If your test results were taken after you added the bleach, then your starting FC dropped below the target for your CYA and it's possible that the green spots could be algae.
One key number is missing from your test results: CC's. This will help determine whether you have algae or other organic contaminants. If your current test kit will not test for CC's, I would suggest looking into one of the recommended kits (see link in my sig).
At this point, you could run an OCLT (link in my sig) and/or see if the green spots are temporary staining from leaves/pollen. If you find that you need to shock, keep in mind that it is not a one-time addition of product.