Akochar Clan

The Akochar are a clan of dwarves who cultivate rock corals.

Cultivation
The Akochar grow the corals in a basic but effective way. The corals are first collected, then pumps connected to waterwheels simulate tides. This encourages the corals to release sex cells.

If the dwarves want to do it in a more efficient way, they can always cut a coral into frags, or fragments, then continue growing the corals. Coral growth is slow, but with such large amounts of coral, there is always more coral to be harvested and multiplied.

Artificially grown coral is more abundant than natural coral, and natural ones are protected by merfolk. For this reason, the Akochar started with only two corals - they managed to somehow steal them - and reproduce them into a sizable coral population.