General Aquaria Discussion • Film on top of new tank

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Film on top of new tank

Postby fishypaws1976 » Mon Jan 18, 2016 6:26 pm

Hi, I recently got a new 65G freshwater tank. I have already cycled it and have put 2 baby Jack Dempsey's in there. There seems to be some film onto of the water. It's not hard to break up but I was just wondering how to get rid of it. Also if anybody knows what it is and what causes it.
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Re: Film on top of new tank

Postby DJRansome » Mon Jan 18, 2016 7:04 pm

Is it oil? Maybe just from the food and normal.
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Re: Film on top of new tank

Postby zimmy » Mon Jan 18, 2016 7:49 pm

Do you feed NLS? As DJ has said food can cause an oily film on the tank. I find NLS in particular causes it.

If that's what it is, increase your water surface agitation and it'll break up and go away. It's not a big deal but can interfere with gas exchange.
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Re: Film on top of new tank

Postby fishypaws1976 » Mon Jan 18, 2016 10:20 pm

No I don't feed NLS.
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Re: Film on top of new tank

Postby lizardboy » Tue Jan 19, 2016 9:13 am

It could just be not enough surface movement (with filters, etc.). Could also be feeding. It's not pleasant to look at, but it's usually harmless
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Re: Film on top of new tank

Postby fmueller » Wed Jan 20, 2016 5:24 am

Any oily surface film consists of organic matter. Your beneficial bacteria will break down any organic matter, as long as they have enough oxygen to do so. You can use a surface extractor to combat the symptom, or increase aeration to attack the root of the problem.

I've never had this problem in any tank with good aeration - and I feed liberal amounts of NLS.
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Re: Film on top of new tank

Postby wortel87 » Mon Jan 25, 2016 11:13 am

Nls is dirty food. Good food. Just really dirty hehe.

But yeah that film is nothing to worry about.
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