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Old 09-10-2005, 05:14 PM   #1
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Oil on the surface

Hi all,
I seem to develop this thick oil on the top of my water. Presently I have to mob it up with a paper towel in order to get rid of it. It very effectively blocks most of the light into the tank if I left it accumulate.
I suspect something is wrong with my tank and that's why this problem has started. However, I cannot figure out what is wrong. Anybody have any suggestions?
Thanks,
Phil
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Old 09-11-2005, 08:46 AM   #2
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There can be 2 things causing this: lack of surface water movement and lack of surface skimming. I'm sure someone will chime in if they are aware of other causes for this. Can you give more details about your tank setup? Maybe some pics could help.

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Old 09-11-2005, 10:48 AM   #3
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A skimmer and Surface Skimming will keep it away. It also causes a lower PH because of the reduced gas exchange with a film of DOCs on the surface.
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Old 09-11-2005, 12:07 PM   #4
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Try aiming your water output so it disrupts the surface. That "oil slick" is no good.
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Old 09-12-2005, 09:28 AM   #5
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I have a protien skimmer running round the clock. I've never heard of a surface skimmer. Can somebody provide more details?
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Old 09-12-2005, 11:46 AM   #6
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a surface skimmer is just a box that forces your protein skimmer to pull the surface of the water off.

http://www.marinedepot.com/md_viewIt...product=AC3323
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Old 09-12-2005, 07:08 PM   #7
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....it gets the surface of the water to fall into the skimmer. and, it makes your skimmer more effective.

BTW...it's not a symptom of anything wrong with your tank. While not good, it is simply a biproduct of your tank/filter design.

It's yet another reason why sumps are so popular. Water falls into the sump from the surface of the tank taking this oil with it.
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