* Over-frequent water changes can stress fish: Frequent water changes disrupt the water chemistry and can lead to fluctuations in temperature, pH, and other parameters that stress the fish.
* Loss of beneficial bacteria: Beneficial bacteria that break down waste and keep the water clean live in the tank's filter media and substrate. Too frequent water changes can wash them away, making it harder for the tank to cycle properly.
* Mineral depletion: Frequent water changes can deplete essential minerals in the water that are vital for fish health.
A Better Approach:
* For a 5-gallon tank, aim for a 25-50% water change weekly. This frequency allows the tank to cycle properly and provides a stable environment for your fish.
* Smaller, more frequent changes are preferable. Instead of a single 25% change, you could do a 10% water change every 2-3 days.
* Use a dechlorinator: Always use a dechlorinator to remove chlorine and chloramine from tap water before adding it to your tank.
Other Considerations:
* Overstocking: A 5-gallon tank is considered very small. Three guppies and white clouds can be too many fish for this size tank, especially if you are only changing 20% of the water daily.
* Filtration: Adequate filtration is crucial in a small tank. Ensure your filter is rated for the tank size and that it provides enough water turnover.
* Tank maintenance: Regular tank maintenance, including cleaning the substrate, removing debris, and cleaning the filter, is essential to maintain water quality.
Consult with a fish expert: If you're unsure about the best water change schedule for your tank, consult with a local fish expert or experienced aquarist for advice. They can help you create a healthy and thriving environment for your fish.