Thanks you very much for updating the title cliff. Yeh you are 100% right, it is going to cost a bit extra to get the holes drilled, but in the long run I'm sure I won't regret it. The three hole overflow system seems very promising, I have done a lot of research and it seems a surefire solution with multiple safety factors built in. Once i get the tank and plumbing i'll upload some photos so people can see how it works.:)