I'd use just live rock and/or Chaeto. I can't really tell how big the chamber is, but I'm not sure if mud or sand would be of any benefit. You'd need a deep bed to help. I'd use Chaeto, and reverse your light cycles. When the display is lit, fuge is not. When the display goes dark, the fuge is lit. This will help keep ph swings in line due to photoperiods.
Dave
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