You bring up a good point on the heater. I originally started out with two heaters in the sump. Unfortunatly it did not do the job once the WI cold hit and I suffered a bout with ich. I since aquired the WON which you can see and left another in the sump. No problems since then as the WON is a superior unit.
I just have not been brave enough to move it to the sump. Maybe this summer when we do not get the temp spikes.
Great deal on the 90g!
Tank: 90 Gal SW Reef in the making
See my info for setup and inhabitant details: