Posted: Thu May 10, 2007 5:29 pm
Maybe add one of those little water fountains in the middle of the pond to create more surface agitation. This will help break up all the protiens and organic matter that collects at the surface (the film on top of the water) and mix it back into the water for the filter to pull it out. You may need to also either cut down on the amount your feeding, do more water changes, or get a more powerful filter.