I watched the BRS video on making an in tank refugium and really like this idea for my 20 gallon tank, as I don't have room underneath for a refugium and like the idea of being able to see it. It will have a nice secondary effect of nutrient export as well. Any recommendations on a good macroalgae for this? I'm not sure cheato fits the display bill, and would like something that grows relatively quickly to get the nutrient export benefit. Thank you!