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Ha! Had me going there, for a second. I have used oyster shells, clam shells, slices of live rock and rubble, crinoid and other fossils, hard coral pieces, and even coral tile. I have a few on plugs as well. Seems I get good growth on all of them. If I plan to frag out a specimen I'll use thinly sliced live rock 'cause it breaks up easily (superglue loves it too).
Is the consensus rubble because it looks natural or because its the best growth medium?
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