sungrow betta stick-on sticker thermometers, 5.2 x 0.7 inches, green & blue temperature indicator, 1 stickers per pack sungrow where should i place the peel & stick betta thermometer? to be the most effective, the sticker betta thermometer by sungrow should be stuck to the outside of your betta tank away from any heat source such as light bulbs or heat pumps. this ensures you receive the most accurate reading and you can adjust your water temperature accordingly. why do i need to monitor the temperature of my betta tank water? to keep your betta fish healthy, happy and active, make sure that they always have clean water at the appropriate temperature. heaters can be temperamental; the betta thermometer monitors the water temperature as well as the functioning of your heater. knowing the current, correct temperature of your betta tank means that you can make proper adjustments to make sure the water temperature is at the ideal temperature for your betta. be proactive and save your betta’s life. it is also important to know the symptoms in your betta fish that suggest your aquarium water is too hot or too cold. cooler temperatures will slow down a betta’s metabolism causing lethargy, inactivity and loss of appetite. when the temperature gets too high, your betta fish will become overactive and may even start burrowing into the gravel. what is the appropriate water temperature for betta? ideally, the water in your betta tank should remain between 78° and 80° fahrenheit (25.5° and 26.5° celsius). most likely you will need a heat source and a reliable betta thermometer to monitor the water temperature. the health of the betta fish will deteriorate quickly if exposed to temperatures below 56°f or above 95°f. they can survive a short time if exposed to moderately high or low temperatures, but a good rule of thumb is to never let your betta tank’s water drop below 74°f (23.5°c).