Wow, nice work Tom!
I really like the way the placement of everything makes it all seem quite natural. I bet those kuhli loaches are absolutely loving that sand! I moved two dojos over to my very first sand-bottomed tank a few weeks ago, but they don't seem to take advantage of the soft bottom in the way that kuhlis would.
The bettas look good in there.
Would you be replacing them with anything if you decide to put them back in their original tank?
BV