7. You can reuse fish aquarium water
When maintaining your aquariums, you can easily reuse the water removed during partial or full water changes. For example, you can use the water to water indoor plants or gardens.
The fish waste is excellent for providing your plants with extra nutrients. If your fish aquariums are planted, other plants will also benefit from the chemicals used to enhance plant growth.
When reusing aquarium water to water other plants, don’t use what that has been treated with medicine or salt.