Can Coldwater Fish Survive In Warm(ER) water?

FRUSTATED

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Have a few goldfish fancy one a few minnows and dace. i heated up the tank to just over 20 degrees celcius(68 fahrenheit) and yesterday i added two guppies one male and one female. the fish seem to be doing ok except the female guppy who is pregnant she is staying near the top between filter and heater. male is ok.
will the coldwater fish survive long or are they ok as they have gotten over the first few days of temp change. its not roasting like its at what would normally be room temp.
any ideas or comments will be greatly appreciated.
thanks in advance!
Thanks very much will the shock kill coldwater lads?female guppy acting strange will not move from one spot. u think the cold temp is the prob?
 
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