A tang isn’t an option as even a small specimen needs much more room. An Emerald crab (Mithraculus sculptus) might eat it, but these can be quite aggressive and cause their own problems. On balance, I ...

The Emerald, or Mithrax crab, is often sold as a natural control for bubble algae. Jeremy Gay explains how to keep it. Requirements: Mithrax crabs require algae on which to graze, a mature reef tank ...