Thank you for your answers and help so far.
About Mayhems Aurora, why is it not the best thing in a long run ? It is mix of dyes (Aurora silver + orange dye). Or does it effect the inside of tubing/waterblocks?
I think the deal is it may clog up over a short period (2-3 months) or so I read somwhere I think...
Basically it hasn't been tested and/or designed for long term use so don't use it really