I'm not sure if I was doing in correctly but I'll share my experience because I had such an awesome tank when running algae scrubbers. My sump had multiple chambers, one of them being a really high chamber which made a small waterfall, this is where the thick bushy algae started to grow. It used the light that was for my chaeto so the lighting schedule was on at night and off during the day. It seems to have grown the algae really well. I've never seen my tank run as good as it did once I had this natural algae scrubber develop in the sump. Make sure to not take out too much algae at at time. You want to have a good amount there so it can grow quickly again taking out all toxins or what not out of your tank.
