Doing regular water changes is also a way for mollies to live without a filter. Frequent water changes maintain the nutrient balance in your aquarium and keep it healthy. It removes excess waste and keeps the tank clean. This way, mollies can survive in your tank for a long time without a filter.

Mostly a mechanical filter media will get rid of physical debris that floats inside the aquariumā€™s water. A mechanical filter media will capture all the solid particles (mostly visible) that float in the water. These can include solid waste that remain from decaying plants, uneaten fish food or fecal waste from the fish and other marine life
Biological filtration actually occurs naturally in a fish tank with or without a filter. This is because the beneficial, nitrifying bacteria will grow on any surface in the fish tank. The locations include the substrate, plants, rocks, decorations, equipment (i.e. heater and bubbler) and more. Chemical filtration is for removing certain
Ammonia is most likely to occur when the fish tank is first set up or each time thereā€™s a water change. When new water enters an aquarium, biological colonies begin growing to filter toxins in the water. If these colonies do not grow fast enough, thereā€™s a high chance ammonia levels will rise. And then, thereā€™s tap water. Betta fish need an aquarium filter to clear the water of any waste, such as debris, rotten or uneaten food, feces, and toxic particles. But another critical benefit of filters is improving water quality by cycling the water. The filter oxygenates the water and keeps its pH levels stable. In theory, your betta fish can live without a filter if Squeeze the sponge filter or gently swish your filter media in a bucket of old tank water to remove the accumulated debris. (Remember that after you clean your tank and filter, the water may remain cloudy for a couple of hours until the filter has a chance to re-gather the floating specks.) If you regularly clean your aquarium but still have Air pumps are used to move water. The carbon dioxide is sent to the surface when bubbles displace the water. External pumps move the air via a hose attached to the pump that is dropped into a tank. This process is repeated until all the bubbles have been removed. Air pumps can be used in a wide variety of aquariums, from small tanks to large tanks. Air pumps are not usually necessary for a fish tank. An air pump helps to oxygenate a fish tank by agitating the surface of the water. As long as you have an adequate filter for your tank, this should create enough of a disturbance making an air pump unnecessary. There are certain situations where an air pump is a good idea, but the primary

A heater maintains water temperature within the desired range, which is essential for your pet fish. If you are to keep a tropical fish tank, your setup needs a heater to be complete. Generally, the water temperature in such aquarium setups should be maintained within the range of 75Ā°F to 80Ā°F (23.9Ā°C to 26.7Ā°C).

Well, disappointing as this answer may be, its not a good idea to turn off a fish tank filter, especially not every or all night. You should never turn off your fish tank filter because it allows bacteria to die and ammonia to build up, which messes with your fishā€™s health. Run your filter pump 24 hours a day (24/7) unless you are doing water
The best size filter for a 55 gallon fish tank is a filter that has a flow rate of 220-275 GPH (gallons per hour). A 55 gallon planted tank will need a filter with a flow rate of 175-220 GPH. A 55 gallon reef tank will need a filter with a flow rate of 285-360 GPH in order to effectively turn over the water.
1. AquaClear Fish Tank Filter. Buy on Amazon Ā» One of the best choices is actually quite a simple one: you can go for this AquaClear fish tank filter, which will allow you to set up and use the filter almost instantly. You can choose various tank sizes, depending on your needs: 5-20 gallons. 10-30 gallons.

Donā€™t sweat about it, this shouldnā€™t be an issue. Best of all, you donā€™t need to empty your tank. A quick gravel vac should get rid of all the tiny particles resting at the bottom of the tank. If you find tiny bits floating through the tank, put some filter floss (50um) in the filter and this will get rid of the free-floating stuff.

Step 2 ā€“ Starting The Nitrogen Cycle. The Nitrosomonas bacteria you want to grow in your fish tank need ammonia to ā€œeat.ā€. A new tank with clean water contains no source of ammonia, so youā€™ll need to add some. You could add a few drops of pure ammonia to the water, but I prefer to use a pinch or two of fish flakes every 12 hours for a 6F3X.
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    • do fish tanks need a filter