I picked up 10 pounds in early November and another 10 pounds from this last batch early this month. Both times I rinsed it off, picked off some branching calcareous algae and any soft material and put it right into my system. Some in the main display, some in a frag tank and the rest in the sump. The system handled whatever ammonia without a problem. No pests seem to have been introduced with it and each piece is clean with no problem algae. I love the shape look and weight of it.

