Temperature of my fish tank.

Question
I live in a very cold house and during the night, the room that my tank is in will often go bellow 5 deg C (41 deg F). I have 4 White Cloud Mountain Minnows in a 25L tank.
Do i need to do anything to keep the tank from getting too cold?

Answer
Hi,
White clouds are native to the mountains of china, so they are actually native to cold water that changes temperature quickly.

I think they'll be ok, but if you're worried, you can buy a heater, as they also do fine in water up to 36oC. for short periods of time.