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  1. General Reef Discussion
    I heard that oily film on the surface is bad. For those pico/nano owners, most of you guys don't have protein skimmer to skim this stuff, right? I have few questions that I am interested in knowing: 1. What causes this oil-like stuff? 2. Why is it bad? 3. Is doing WC the only way to fix it? 4...
  2. General Reef Discussion
    I have a 29 gal Biocube reef tank. I often get an oily film on the top of the water. Why doesn't my filter take care of this, and how do I make it go away? Is it harmful to the tank?:arg:
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