Strawberry Basslet

We have a Royal Gramma in a gallon 55 years and we wanted to know if we can add a basslet strawberry.

I guess if
While your tank is relatively small Gramma has a slightly different color and should be considered by the basslet not be a threat and vice versa
I had two in a 200 imperial gallon system.
you can always move the rocks around in your tank etc.
so the fish feel in a new territory