CichlidFish.com - Fish That Think.

When scrubbing algae on the inside aquarium glass, use light-colored scrubbers. (I use Scotchbrite pads), Why? Because it's easier to see the algae you're trying to scrub!

true.

I use the metal scraper, and I have a hard time seeing if I scraped a spot or not until I am done.  I just try to be methodical ...  either that or I need to let it build up more before I do it!!!  I am trying to let it grow on the back and sides, it seems to grow slower when you want it to grow, and seems to be uncontrollable when you try to keep it scraped!!!