Keeping your fish happy and healthy starts with the right aquarium maintenance, including proper heating, lighting, feeding, and water care. Following are some tips to help make your tank water sparkle and your fish happy. 1. Keep the water at a steady temperature. The ideal temperature for your aquarium is between 78 and 82 degrees Fahrenheit. Your thermometer should be placed away from the filter and heater, where the water is cooler. 2. Turn off your lights for about eight hours, once a week. This will mimic the fish's natural cycle, which is not to be confused with their feeding cycle. 3. Feed fish twice a day, once in the morning, and once at night. Use the same feeding standard for all of your fish. 4. Don't keep plants and fish together. Plants require more oxygen than fish do. Keep your fish away from your plants. 5. Get rid of any dead fish and regularly change 20% of the water in your tank. 6. Remove any dead leaves or plants. If you have live plants, remove any leaves that have turned brown. 7. Clean your filter to remove any dead bacteria or algae. 8. Replace any lost or damaged items in your tank.