Rewrite the description below by replacing repetitive words and phrases with synonyms.
A coral reef is a group of coral colonies that form an underwater community of animals and plants.
A coral reef is an assembly of coral clusters that create an aquatic ecosystem inhabited by fauna and flora.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the description below by replacing repetitive words and phrases with synonyms.

### Input:
A coral reef is a group of coral colonies that form an underwater community of animals and plants.

### Output:
A coral reef is an assembly of coral clusters that create an aquatic ecosystem inhabited by fauna and flora.