the concept seems somewhat sound......I see a couple issues tho......first being the grout....grout is corrosive and has dyes and binding agents in it....Im not sure I would put it my tank....also I think with it being constantly submerged it would likely break down over time.....using a reef safe concrete (forget the name now) might be a better choice of material....the second issue is, its doubtful that the encrusting monti will grow downward or on the underside of the plates, so you would probably need multiple frags, one for each plate.....
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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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