Melev has them 16" away. I am runnning 250's and keep them 14" away. The temp in the room is 73. I am able to keep the temp within .5 degrees running my halides for 7 hours straight using a $13 fan.
The new ballasts have not come in yet so I have not determined if I will be able to control the temp running 400's.
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120 G in wall mixed reef, 35 G 4' long prop, 35G sump/fuge, 19G RODI resevoir. Sink & few gadgets.
Current Tank Info: 120G Mixed reef, started 10/15/2009
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