K.J.
LUK ITS A FUZBALL
How do you heat a jarred betta? It's tupperware-esque jars. We can't rely on room temperature, if it got any colder in washington it'd be a blizzard and here alone I have to have heat-generating lamps above each tank, and then it only heats it to a measly 73f.
or buy a big tank or box and buy a heater.Fill the box to like 2 inch of water and put the jars inside the tank/box.O you will also need an airstone.