if it is indeed only a six hour outage then I wouldnt think that the airstone would be necessary......your battery backed up vortechs should be enough......you could perhaps move the vortechs up a little on the tank to get them closer to the surface.....another thing you could do is change your timer so that your lights come on earlier than normal, so that the water has a chance to heat up a bit from the lights before the power gets cut........now if the planned outage takes longer than planned, then you may need to be concerned with temperature drop.....
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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