I received some cold cathode uv light tubes today:
Think I now need to do something with the water - a UV additive perhaps?
For clarity, the tubes at top and bottom are just resting (top one is held in place only by the loops of 8-pin cable and CPU fan header
I was not sure where they could fit (top one was a nightmare to insert after all the other hardware!) so might remove and attach to the upper radiator instead so that it is hidden by the side panel. The lower one can't be hidden but might install it on the right next to the smaller panel.