You must be a complete fucking retard then. The only thing you asked was how to "cool the water in the rez". Your dumbass didn't say anything specific at all. So I gave a general answer. Fuck you, I am not what you would call a "Moron".
Your shit is hot that's no good. Pythium loves hot. You can go the quick route of putting ice in plastic bags, but that gets old quick. Can you put your res on a concrete floor?
Having a larger res. is always better. Water tends to stay cooler, you don't need to change nutes as often. If you can try to get a larger res. , pumps and air stones tend to generate heat. So it's better to have more water for this heat to dispurse into.