Could coral float?

I've been thinking about worlds like Keplar-62e, thought to be covered in deep oceans, and wondering about floating reefs. Could a bio-structure substantially similar to terrestrial coral hold enough gas pockets, preferably in the form of bio-generated Hydrogen, to float neutral-buoyant close to the surface or does the math just not hold up?

Edit: Pumice has been pointed out to me, how embarrassing, but I'm looking for something with less porosity and greater bulk strength to form a floating reef that will largely withstand extremes of weather etc...

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Could coral float?

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