Aquarium maintenance involves regular tasks to keep the aquatic environment healthy for fish and plants. This includes checking water quality, which means testing for pH, ammonia, nitrites, and nitrates. Regular water changes, typically 10-20% weekly, help remove toxins and replenish essential minerals. Cleaning the aquarium is also crucial. This includes scrubbing algae from the glass and decorations, vacuuming the substrate to remove waste, and ensuring filters are functioning properly. Maintaining the right temperature and providing adequate lighting are essential for the well-being of the fish and aquatic plants in the aquarium.