OH MY GOSH! Look at my tank, the guppies amount has multiplyed in just a few days. How a big deal! It seems that i need to consider changing a big tank a few days after. 
I must say that thanks to your temperature controller, they spend a cozy time this period in this cold winter! Here I share some tips.
In my house, the room temperature is 21 degrees and the water temperature of the tank is 24 degrees after I put the controller itc-306a in. If the room temperature is not too low, just a few degrees higher than the room temperature. If the room temperature is low, increase the temperature little by little. Large fish are fine, but fry can get sick if the temperature difference is suddenly too high.
Or any other fish lovers can also come up with your suggestions. Great welcome!
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