Human: What is the best way to keep a fish tank? Assistant: 
The best way to keep a fish tank is to make sure that it has clean water, adequate lighting, and a stable temperature. You should also regularly check for any potential health issues in your fish and adjust their environment accordingly. Additionally, you should provide a variety of live plants, gravel or stones, decorations such as rocks and driftwood, and an appropriate substrate (such as sand or gravel) to help with the filtration process. Finally, regular cleaning and maintenance of your aquarium will ensure that it remains healthy and safe for your fish.