I am cycling my new Red Sea 200XL tank and I have noticed something collecting on the outside of the filter sock as pictured. When I try to remove the filter sock it comes off in strands and collects on the pump intake as shown. I added an Aquamaxx filter matt ahead of the sock but this has not helped.
Any thoughts on what it might be and how to eliminate it?
Any thoughts on what it might be and how to eliminate it?