Yellow Prawn Goby Started to sift sand

tubz

Reefing newb
My yellow prawn goby I've had in my 55 gallon for maybe 6 months just recently started to sift sand. These gobies aren't listed in the sand sifter category and am just wondering if this could be harmful to him in anyway? Are their gills and everything the same as say a diamond goby? I just find it odd that all of a sudden he started doing this.
 
The yellow prawn goby is a type of watchman goby, and I'm pretty sure it is normal for watchman gobies to sift sand - my pink spotted watchman does, and the ones I've seen in the LFS do too!
 
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