Ok, I love the idea of an algae scrubber. Filtering through a more diverse, balanced eco system makes great sense. One of the first thoughts I had after looking up the basics is, why not use a nylon or polyester sock for the substrate? Everyone seems to be using some form of ruffed up plastic for a lot of surface area on something that won't degrade. A sock seems to already fit the bill. I know there is usually some spandex in socks. Could that be a problem?