I think BRS is awesome to share these videos and to help us better understand our reef tanks. There are so many variations on maintaining reef tanks, filter socks vs no filter socks, skimmers vs no skimmers, on and on, all in an attempt to manage nutrients and export. I have changed out filter socks weekly for years. Twice a week sounds like so much more work but on the other hand I hate changing out GFO. I find it time consuming and messy to both clean out the reactor and rinse the GFO medium. Maybe I will try twice weekly filter sock change outs as an alternative. Thank you BRS for sharing the information