I am using a rubbermaid sump for my system. I used 2 rubbermaids to prevent bowing. Be sure to get the ones that are not straight on the sides because those bow our quite a bit. Anyways, I currently have my macroalgae growing in the system.
I have the water come into the system that has macroalgae growing. Inside, I have a beaker where it houses 2 Maxijet 1200s to act as my return pumps. All in all, I am happy with the setup.
Shawn