Long Gold

how I can keep gold fish in a long time in the aquarium without changing the water maps?

I have an aquarium which has dimension 18 x 12 x 15 inches (Lenth X Width X height) and have 4 gold fish that is 4 inches wide, so I have to change water for a few days only 15 to 20 days is why I want a solution, except for using aqua filter that purifies the water.

There is none. Without a filter in the water. And the more fish you want to change the water about every 10 days. Its a simple matter of physics



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