The water changes depending on the type of aquarium you keep – tropical, cold, or oceanic – and whether you use tap water or purified water. Changing the water is an important part of fish farming and, if done right, cannot be overdone.
Remember that in nature, dilution is the greatest form of filtering because waste products are carried through a very large area of water and even the best filters will not remove nitrates and replace important minerals in your aquarium. You can also buy gfo reactor via https://www.marinedepot.com/aquamaxx-fluidized-gfo-and-carbon-filter-media-reactor-standardFrequency
It is advisable to change about 25% of the water in the tank per week as this will help keep nitrate levels low. If you are using tap water to switch, test it to make sure the pH and hardness match the taste of your fish.
Also, check if the nitrate levels in tap water are low enough. If the nitrate reads 40ppm or more it can actually help increase the nitrate level in the main tank.
If so, consider looking for alternative sources of water or air purifiers. If you are in doubt about the suitability of local tap water, please contact your local authorities.
The most effective way to keep a tank clean is to combine water changes with filter treatment, wiping away algae, and vacuuming the gravel.