My 24 gallon nano cube been up for about 7 months now. Two days ago I removed the two big rectangular sponges from my back chambers because of detritous buildup and possibly nitrate buildup. Now, I have lots of free-floating particles in my water and there's nothing to trap them. I do not use a protien skimmer and am not really planning on ever getting one. Should I keep one sponge in place, and rotate them frequently? If so, how should I clean it when I take it out and how often should I rotate them?