What does it mean to take 25 percent of the water out and put back in for a fish tank how do you that?

To take out and replace 25% of the water from a fish tank, follow these steps:

1. Calculate the volume of water that you need to remove. To do this, multiply the length, width, and height of your tank in inches to get the volume in cubic inches. Then, divide the volume in cubic inches by 231 to get the volume in gallons. Finally, multiply the volume in gallons by 0.25 to get the volume of water that you need to remove.

2. Use a bucket or other container to remove the water from the tank. Be careful not to disturb the fish or plants in the tank. Remove 25.0 g

3. Refill the tank with clean, dechlorinated water. Use a water conditioner to remove any harmful chemicals from the water. Add water to bring the aquarium's liquid level up to within 1/2 inch below the tank's frameless rim or to an even lower point just enough to allow your heater and filter's components to remain inside the aquarium

4. Turn on the filter and heater in the tank. Make sure that the temperature of the water is suitable for your fish.

Here are some tips for taking out and replacing water in a fish tank:

-Always use clean, dechlorinated water. Do not use tap water, as it may contain harmful chemicals.

-Be careful not to disturb the fish or plants in the tank.

-Replace 25% of the water in the tank every 2-4 weeks.