Oh well that happens for any cooling solution though. If you have an air cooler, it might not keep up with the cpu temps. However if you don't overclock too much it should be no problem.
[This is only for open loop systems. Yours is closed loop, so no maintenance. However it is a good idea to keep an eye out for leaks and such]
And I think the only thing you have to do is top off the liquid if it runs low. So just check every few weeks or something. Sometimes you have to drain and replace the fluids, dont know what time interval the manual should tell you. You could always ask the people building the computer for you about maintenance too.