Barrel __ Is the 'redwood of the Reef'

This page is the CodyCross answer for the clue below from Fauna and Flora, Group 176, Puzzle 1 (Apex Predator).

Question is: Barrel __ Is the 'redwood of the Reef'

and the answer is: SPONGE

Word Meaning:

SPONGE — (countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.

Definitions from Wiktionary.

Barrel __ is the 'redwood of the reef' — CodyCross Answer | CodyCross Solutions