Yep looks like algae. Steve, what you are doing will work, but keep in mind that your filters are not exactly designed for intensive management. If you are just planning on feeding your family, what you have should work fine. The greenwater is a big plus for you. But if you want to get into the 2 pounds of fish per cubic foot range, you will really need to beef it up. I think you could use the outflow from those filters to turn an RBC, and you could really jump up your carrying capacity.
