Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the zip.

Usage

1. Open the 3D Viewport sidebar (N) and the Coral tab.
2. With nothing selected, click any design (or Random Coral / Random Reef) to add it at the 3D cursor.
3. Keep the coral selected to edit it: change type, size, colors, or press Randomize / Variation.
4. Open Shape, Color, Water Sway and Reef Patch sub-panels for fine control.
5. Press play on the timeline to see the water sway. Deselect everything to add another coral.

Game export

Set Detail to 0 for low poly. Colors live in the Col vertex color attribute, which glTF and FBX export.