Goldfish appear to be pulling in air at top

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06 Nov 2007 14:50 #1 by dclifford (Derek Clifford)
A guy in work has told me that he noticed his goldfish seem to be hanging around the top of the tank somtimes gulping air.

I think I found the problem after asking some questions.
I gave him some offcuts of some plants from my tank. He had not had live plants before this. It turns out that the light on the tank is only on for a couple of hours in the evening, with that tank in a darkened room.
Am I right in assuming that the plants are taking the oxegen out of the water because they are in near darkness the majority of the day?

Remedy:
1st step is to complete a partial water change.
2nd step is to remove the plants or increase the lighting to about 10 hours a day.

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06 Nov 2007 20:07 #2 by KenS (Ken Simpson)
The plants aren't causing the problem. In fact they should increase oxygen as plants do the opposite to animals by taking in C02 and giving off oxygen.

We would need to know some more about the tank. What size is it? How many fish and what size? What type of filtration?

You're right in terms of the first course of action being a water change. I would recommend at least 50% using water the same temperature as that in the tank and conditioned with dechlorinator.

Regards,

Ken.

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  • Anthony (Anthony)
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06 Nov 2007 22:58 #3 by Anthony (Anthony)
Replied by Anthony (Anthony) on topic Re:Goldfish appear to be pulling in air at top
Hi Ken.
Plants do release c02 at night. Thats why in a planted tank
the pH drops during the night.
I cant` see the darkness being the problem. More than likely
a water quality problem.

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07 Nov 2007 00:32 #4 by KenS (Ken Simpson)
I'm not sure if that's true. I know if you're adding C02 to the tank, that the level goes up during lights out as the plants don't absorb it. I don't think they release C02. However, I could be wrong.

All that aside, I do agree that this is a water problem and would be interested to know what filter is being used and if the tank has been cycled.

Regards,

Ken.

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07 Nov 2007 09:23 #5 by dclifford (Derek Clifford)
That is why flowers are always taken out of hospital wards at night. Because during the night(darkness) plants will take in oxegen.
The tank is a small tank with approximatley 50 litres in it. It has an internal filter rated to the tank and the system has been running for over a year now.

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07 Nov 2007 11:19 #6 by essjay (S Jackson)
what about adding an air pump to get some surface movement going?

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07 Nov 2007 12:22 #7 by KenS (Ken Simpson)
I would doubt that the plants are the cause of the problem. Do you have a facility to test the water. Most likely it's a water problem.

Regards,

Ken.

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07 Nov 2007 15:55 #8 by Valerie (Valerie)
Replied by Valerie (Valerie) on topic Re:Goldfish appear to be pulling in air at top
Another idea ... once the water has been tested and the parameters are showing ok, would be to add a friend to the tank and see how the new addition reacts ?

Valerie

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