This is the best algae scrubber forum out there. https://www.algaescrubbing.com/forums/
The guy running it (Turbo) is trying to sell his products, so bear that in mind, but he's also very open to be challenged, and to people posting about different methods to grow turf algae. There's a guy on there called @Garf
who has been leading the way for a while now in experimenting with different methods, and recording the results in a pretty scientific way. Have a look in the DIY section of the forum to see various designs and ideas.
I tried it a while back, but my waterfall fell over and spashed my lights, shorting them out. I couldn't be bothered to start over. Maybe one day.