Are you referring to floating debri in your water column? What kind of filtration are you running? You could try adding another mechanical filter to your tank, or adding more mechanical filtration media to your current filtration system. A spong over the intake of a filter will work nicely. Just pull that sponge out once a week and rinse it well.
What kind of algae eater are you referring to? There are a few algae eaters who will rather eat fish food rather than algae. Cutting back on the amount you feed should solve that problem somewhat. Algae eaters cannot be depended upon completely to solve an algae problem neither. Its mostly a matter of balancing nutrient, light and CO2 concentrations within your tank.
HTH
-Richer