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A properly working filter can really improve the living conditions for your goldfish and will almost double the tanks holding capacity. The tank you have though is not large enough for any kind of goldfish. 1" of fish needs 1 gallon of water. Your goldfish will grow to around 10" if given reasonable conditions. That is going to max out your tank with just 1 fish.

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Q: Is necessary to add filter machine in the fish tank of 2 x1 x1.25 and tank contain goldfish red cap?
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Can you put a goldfish in a tank without a fillter?

Yes. A goldfish can live without a filter. They may not live as long, but they do not have to have a filter, or a heater. I had goldfish in a five gallon tank without a filter for a long time. Hope that this helps.


How do you stop your goldfish being blown about by the filter?

If your goldfish is being blown about by the current created by the filter then the fish is either playing in the current deliberately, or the current is too strong for the tank size. Most filters can be adjusted to increase or decrease the amount of water flow. If necessary you can decrease the amount of water flow.


Can you put a filter on a goldfish bowl?

No you idiot ! Dangit ! :/


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How should you take care of your goldfish?

They definitely need a air pump, a filter, at least 20 gallons of water for one goldfish, a thermometer, and decorations to improve the goldfish's well-being/mood.


Do goldfish live longer with a filter?

I believe that they do because their gills take in oxygen and the filter would help generate the oxygen.


Do goldfish need an air filter to live?

No, but it helps them live longer and healthier.


Can goldfish live in a one gallon tank with no filter?

For a few days yes.


What kind of shelter do goldfish need if you have 1?

One goldfish requires at minimum a 20 gallon aquarium with a filter, and an air stone would be nice


Why are Goldfish picking at your Oscar?

You have no idea? well maybe you should change the filter or get a life


Is it a law to have a filter in your tank for your goldfish?

There is no law requiring people to put filters in a goldfish tank (if there was than quite a few people would be in trouble for keeping their fish in tiny goldfish bowls with no filtration or aeration). However there are a lot of advantages to having a filter in a goldfish aquarium. For one, a filter serves as home for nitrosomas and nitrobacter bacteria that help with the nitrogen cycle and ultimately keep the water quality in a tank good. A filter will also remove unsightly waste particles in the water and provides a slight current in the tank. Lastly a filter will usually provide some sort of aeration thus raising the dissolved oxygen levels significantly.