Cold Tank

[Coralgurl]

Got up this morning, checked the tanks and noticed the heater was unplugged...kids making smoothies yesterday, and the heater was plugged into one of the counter outlets. I leave the window beside the tank open so now the heater is reading 68 degrees. I turned the lights on and everything looks ok, including the fish. Will keep an eye on it but should I be worried, how fast should I raise the temp or just let the heaters warm things back up?