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The answer to this is that it may not, but it is a bad idea to do it.

The purpose of the filter is to provide a living space for beneficial bacteria that breaks down the harmful chemicals in your fish's waste and in uneaten food that rots in the tank. When your filter runs, it pulls water through a spongy material full of the bacteria, and the bacteria actually eats these harmful chemicals that are in the water, protecting your fish.

When you turn off your filter, you do two things:

1) You stop cleaning the water, and levels of harmful chemicals in the water will increase.

2) You starve the bacteria, causing it to die off, resulting in the filter being less effective when you run it during the daytime.

If you only have a few small fish that don't produce a lot of waste, this might not cause any problems. The amount of bad chemicals in the water may not get high enough to be harmful to your fish. And the filter may not need a lot of bacteria to clean up the small amounts of waste when it is running.

You should read up on the Nitrogen Cycle that occurs in aquariums. You can buy test kits to check for harmful chemicals in the water. Then you could try turning your filter off at night and see if the chemicals increase to dangerous levels. You should always buy the liquid test kits, not the little strips of paper, because the liquid kits are much more accurate.

But really, I strongly advise you to leave the filter on at all times.

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15y ago

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