Hi all,I got myself my tank,long last Lots of cleaning and re-finishing,the stand sanded and painted with hammerite,did some cabnet work,orderd me a new 4ft sump(should get it within this week). set up:1500x500x650(water level at 600) Centre overflow 2x25mm and 1x50mm holes in overflow. 2x250 MH (picking up this week, need to rework the unit) 4ft sump with 3 sections. And thats about how far I have got.I am a little worried about the centre overflow as it seems to stop or disrupt the flow,saw this when I was doing a leak test with power heads in there.Will be getting a vortec so hope this will help.I will be using the 50mm as the main overflow to my sump and one of the 25mm for return,the other I will be using for all my cables etc. Your input would be great. Thanks guys.