What kind of substrate are you using? Was it adequately washed beforehand? Could it be that you are over feeding or that your fish are just messy eaters and a cat or two on the bottom might help. (Most of the fish you have listed, bar one or two, are to not put too fine a point on, pigs!) Also, could it be the food? I once bought some tetramin sinking algae wafers (which had very little algae in them) and they would without fail cloud the water by the next morning. Jeff