Classic indicator needle: A thin, elegant needle that moves across a background marked with the temperature. This is a very traditional style, but you can modernize it with bright colors or unique needle patterns. Fine lines and clear numbers: Use very thin lines to mark the main and secondary temperature divisions. The numbers can be small and minimalistic, present only in the main markings (e.g. every 5 degrees). This keeps the thermometer discreet but functional. Minimalist Iconography: Instead of numbers, you can use very simple icons to indicate certain temperatures. For example, a snowflake for the coldest, a small sun for the warmest, and maybe a drop for the ideal water range. These icons should be very simplified to maintain the minimalist approach. Aquarium Integration: Think about how the thermometer will look once it is placed in inside the aquarium. You can design the thermometer so that its base blends into the aquarium substrate, like a small decorative element that fits naturally into the environment.