K so I'm (hopefully) going to be getting a 10 gallon fish tank for Christmas. I'll be putting my Betta in with some Albino cory cats. The preferable temperature in that kind of thank is around 79 degrees, I know, but I don't have a heater since the temperature of my water is 86 degrees /= is there any way to cool down the water? I can't really change the room temperature because I'm not supposed to be running the AC all the time (I live in an old house with an AC in the window...) Do heaters cool down the water? Is any equipment sold that cools down the water? Thanks.