Yes the DR will become LR
after a few months. It will rejuvinate on its own.
Question...The sand you added, was it in commercial bags or from someones tank?
I know that most of the commercial bought live sand is just sand and water with bacteria added. If that is the case, you may want to find a LFS
or a friend that you can get a couple of cups from. This will hopefully have the critters that you want. These will also come in time but the addition of LS
never hurts. Sounds like it is going fine...You can also Put a few pieces of LR
on the sand and it will seed the sand. There are many ways out there to accomplish the same thing. Patience and care will reap a good lively tank...
Hopefully, the sand that was in the tank is not completely dead. This will be great...