brown tubular sponge
... that the brown tubular sponge often has a colonial coral living symbiotically on its surface?
... that the <b id="mwDFk"><a href="./Agelas_schmidti" id="mwDFo" rel="mw:WikiLink" title="Agelas schmidti">brown tubular sponge</a></b> often has a <a href="./Colony_(biology)" id="mwDFs" rel="mw:WikiLink" title="Colony (biology)">colonial</a> <a href="./Coral" id="mwDFw" rel="mw:WikiLink" title="Coral">coral</a> living <a href="./Symbiosis" id="mwDF0" rel="mw:WikiLink" title="Symbiosis">symbiotically</a> on its surface?