Originally Posted by Reefing Madness
And the Rock from Bulk Reef Supply is what?
their "reef saver" variety is all natural rock/coral skeletons from ancient dead reefs.
Bulk Dry Live Rock & Live Sand - Bulk Reef Supply
which they do strongly recommend curing before use. even though it has been soaked and rinsed, there is still a high percentile chance that there are still bits of organic material deep in the crevices of the rock, hence the need to cure it and the ammonia spike.
the other types, Fiji, Pukani and Tonga, are all harvested from the ocean and while they have been cleaned and dried, they are still full of stuff and need to be cured.
"NOTE: This rock does come out of the ocean and may have some dead material on it such as sponges or other critters. We strongly suggest soaking or curing the rock before use in an active aquarium."
the only man-made rock they offer is this;
Project Reef Rock 2.1 Dry Rock - Walt Smith - Rock & Sand - Bulk Reef Supply
Haven't you ever read the descriptions?