I've got an upflow algae scrubber already but its not the greatest design.
Made it out of a rubber maid container and have a screen and airstone attached and i do get a lot of brown and red growth but very little green.
It's been running for about 2 months now but i think my problem is when i clean it off nearly everything is coming off the screen and nothings sticking to it after its cleaned so then
it takes awhile to grow again.