Add an aquarium heater. Make sure you choose a heater with the correct wattage for your aquarium's water volume.
Hot Water
it changes the temp. by the temperature outside,like if its cold out the water will be cold and if it's hot outside than the water will be hot
Yes, if they are cold water fish and they are in there for a long time. Tropical fish could stand the water a bit hotter. But not too hot. Though i would'nt try it.
make it cold or make it hot
I would use hot water conn. on it. Both on cold and hot
we should put them in hot, warm or cold water
Hot water has the energy(heat) to make the change go faster
Water can be hot or cold if you want
because when you get out of the baths of hot water its a bigger change in temp rather than after you get out of one with a cold water than the temp in te house will be warmer than ur bath
In fact hot water freezes quicker in a cold climate, because of the sudden temperature change. If you want to test it for yourself, take two ice trays, fill one with cold water and one with very hot water, stick them in the freezer, and see that the hot water freezes quicker.
HOT rises COLD sinks
I think not because cold water is heaver than hot water and hot water rises to the top and cold drops to the bottom.