You don't see a lot of those dats in that video that has been cut out of another video. The tank is too well lit, there are no hiding places, the sand is too clean and level. I think I have seen the full video before.
That does not look to me where those dats were grown out. And certainly not where they would be happy and thrive.
It looks to me as if that tank and inhabitants (and the girl on the left) have been slung together for the sake of making a flashy video.
Having said that, those IT could be anywhere between three and ten years old.
If you are going to keep dats - which I would recommend - you need not think that that is a suitable setup.