its no biggy lol!
No, the most common misconceptions are...
1) The fluid, it makes no difference what you use unless you use something like milk
2) The size of res makes no difference to the ultimate temp, just takes your water longer to get to the temp it'll end up at, there's a slight difference if you had a res with a huge surface area but negligable
3) Physics makes it impossible to ever be below ambient, even if you could you'd end up making condensation which would trash your pc
thats about it, oh and don't put your pc in a fridge, the fridge would break.