Yep I have heaters in my sump at the, 3 to be exact each set at 1 deg below the other (all three are 300 watt)
The two tanks that I have are 48"x18"x18", you can see a picture of them at http://members.optushome.com.au/fish...s/DCP_0081.JPG
as you can see by the pic I have the overflows built into the tanks. You may want to look at these pics to get a better Idea of the setup
I plan on putting about 20kg (about 45lbs) of live rock into each tank and about 10-15kg in the Refugium/sump and as you can see by the plans for my Refugium/sump (http://members.optushome.com.au/fish...alt%20Sump.JPG
I will also have live sand in it as well as in my two tanks.
For lighting I am using 2x32 watt flourescents in each tank (planning on 4 in each tank) and just keeping a couple of soft corals later
About i/2 of the water comming from my skimmer will go over the LR
the other 1/2 will go straight to the return pumps chamber.
Hope all this helps, any comments on how to improve this would be appreciated