I did some digging but I have not really found an answer. I am looking at getting a fleece roller and in general I am trying to be environmentally friendly. Fleece is normally made from synthetic materials, usually recycled plastics, is there any option out there that would biodegrade or is using wool instead of plastics to make the rolls? I am specifically looking at getting a redsea reefmat 500 if that makes any difference to the conversation. I do not keep many fish, mostly just corals and clean up crew in a 57gal total volume tank and sump but im trying to polish the water and deal with the general stuff that flows through so the skimmer does not have to work as hard.