Looks like epoxy coated coral bits to me I don't think I would pay more for that would prefer a more natural rock looking one and larger. My two cents.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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