[ThRoewer]

Now, in a dedicated system these guys could actually do good. I mean, they are reef-building organisms after all. In the Mediterranean these snails, feather duster worms, and coralline algae are the primary organisms to build reefs and create life rock. Given how fast they can grow even under suboptimal conditions could make them a prime choice to create tank grown life rock with great porosity, natural shape, and a very low dry weight.
Of course you would have to sterilize the so created rocks and then revive them with actually desirable organisms in a vermetid free system.

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