I wouldnt change anything in that tank.
Is that Caramine lyrata in the left hand side of the tank, if so I would maybe slip a nice dark piece of wood behind it and let the vines grow all over it.
And/Or add a nice dark colored piece of stone in front of it and just let the tank grow out. The right side looks nice and I think just a splash of color would offset all the greens. Maybe a few stems of R. wallichi or R. indica for some red hues. Not bunches but rather scattered stems to blend it all together.
The plants look very healthy, nice job
