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Old 06-30-2010, 05:42 PM   #1 
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Join Date: Jun 2010
Lightbulb Foam while cycling?

I'm cycling my 5gal tank for several days and now there's foam/bubbles on the top near where the filter is. I haven't put alot of water conditioner in, which I know can cause the foam. I've heard that it can be a bacterial is that possible without any fish? Should I do a 100% water is my water contaminated with something that I don't know of? Has this happened to anyone else? Thanks for the replies :)
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Old 06-30-2010, 06:02 PM   #2 
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Location: Santa Cruz, CA
That's happening with mine also. I think it's just foam caused by the splashing waterfall of the water from the filter.
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Old 06-30-2010, 06:34 PM   #3 
Join Date: Mar 2010
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If you are using ammonia to fishless cycle check and see if it has surfactant in it as this will cause foaming.
New set-up can also cause foaming if not rinsed well enough
How bad is the foam, got pics?
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Old 07-01-2010, 01:37 PM   #4 
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If you are using something like rotting food, (many people use fish food, a slice of ham, or a piece of shrimp) to cycle the tank it may be a protein film that's being churned into a foam by your filter/bubbler.

I don't understand what you mean about bacterial overgrowth being impossible without fish--the entire point of cycling is to cause an overgrowth of beneficial n-bacteria. If the bacteria have a food source, the tank will be colonized eventually with bacteria.

If you are using ammonia that has surfactants, you need to clean everything out, find ammonia that is pure, surfactant free (usually the cheapest most generic kind you can get) and start over.
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