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Re: water surface film...


Is the water surface of your tank still ? If so, and depending on fish load
and other factors, the film can be naturally formed from greasy wastes from 
fish (and plants perhaps ?). I did several experiments to understand how to 
clear a still water surface with inexpensive DIY devices. My travails and 
results are described at http://www.thekrib.com/Filters/Busko/. The particular 
contraption in the pictures is still working with no modifications and almost 
no maintenance, after many months. The surface is always mirror-clear. Maybe 
the info in there can be of help.

- Ivo Busko
  Baltimore, MD