just cause it grew algae on it, doesnt mean its live......if you've used marco, then you know how dense it is..its basically fossilized live rock...it has lots of holes, but is not porous....I would really bout that even after a year in a tank, that it would be as good filtration wise as " live rock".....
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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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