I have a 75 gallon freshwater tank. The water always seems to have matter floating around. I do weekly 30% water changes. I have roughly 20 various fish in it. I am running a eheim 2028 good for 150 gallons and a fluval 206 good for 50 gallons. With over 200 rated gallons worth of filtration I would think the water should be clear. I also have two layers I 100 micron pads in the eheim. Long story short, is circulation perhaps a culprit to the floating debris?