I think the scenario would be perfect (Fuge with a Deep (minimum 6") sand bed), but yes, 13g is way too small. And if I remember correctly they should be kept in groups, they are found this way in the wild and be less stressed if they aren't alone.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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