If the tank is properly cycled, you should be able to move all the coral at once. Coral doesnt add much of a bio-load at all, compared to fish. The fish you may have to be a little more careful with. First time Ive ever heard of someone being worried about putting sps under MH. As said previously as long as you acclimate the coral to the light you should be ok.
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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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