Compatible?

Yellow watchman goby eat out of the sand by sifting... a 29g tank, especially a biocube which is even less footprint than a normal 29g tank would be, probably doesnt have the microfauna in the sand bed for it to survive on.

I'd add a fish that eats out of the water column if possible.
 
However nano tanks pretty much always have a way for a BSJ to jump. Be aware that they are prolific jumpers.
 

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