Check out Coral reef low poly Low-poly 3D model on CGTrader for $59. High-quality mesh by Bondiana: 7299 polys, 7338 vertices. Textured, UV Mapped.
OBJ (OBJ, filesize: 18 MB), 3DS (3D Studio, filesize: 8.81 MB), C4D (Cinema 4D, filesize: 9.56 MB), MAX (Autodesk 3ds Max, filesize: 8.94 MB), FBX (Autodesk FBX, filesize: 9.38 MB), MA (Autodesk Maya, filesize: 9.05 MB)