Hey Guys!
if you check my aquarium info, I have a 15 gallon aquarium, currently home to 3 Cherry Barbs and 3 Glowlight Tetras.

My aquarium is placed between my house entrance door and the windows.

My windows are always opened during the day to let air in and out. I live in Malaysia, which is currently a hot country.
My water temperature stated in my thermometer is 30 to 32 degrees celcius. Cherry Barbs and Glowlight Tetras are suitable in temperatures at about 25 to 28 degrees celcius, right? So how do I lower the water temperature?

I've tried putting ice cubes several times but the temperature unfortunately went up again! What should I do?
