Nice Video. Cool Dive. Fun Fish.
Yes they are fantastic to keep Sand White and Amazingly Clean. Takes the chore out of maintaining a clean sand bed (which I hated).
Hope your Goby continues to behave.
Once My Diamond Back Goby got bigger and got accustomed to the Tank, he got into bad habits.
Would fill up his mouth with gobs of sand, and pour it all over my Rocks, and into Cup like Corals (filling them).
I would have to dust things off to keep things tidy...but it would only last for a day.
He would make volcanic mountains all over the tank.
Carved out tunnels under rocks which they shifted (so make sure your rockwork in on solid ground, not up on sand)
I wish I could have kept him for his Amazing Sand bed cleaning skills.
Unfortunately when things got too bad, I got rid of him and the sand bed too.
Hoping your's does well.