Just an update guys... I managed to get to the shop yesterday before they had put the holes in my new 150G, thank god
Now instead of having two in the bottom and one in each top corner, I've got 6 along the back. Two in each corner and another two each side of the centre tank brace.
I plan on going with the horizontal overflows for the back of the tank and run the centre holes as closed loop returns.
Cheers
