Well first you DON'T put water in a liquid cooled pc(at least modern ones). I believe the liquid cooler you have is sealed you don't have to change the liquid or anything like that.
Has the room your playing in, increased in tempature? Did you move it into a cabinet or into aplace where heat might be able to build up?
3-4 degrees probably doesn't signal a big problem unless it keeps going up. If it is unplug the computer and contact tech support at ibuypower because your cooler could be defective.