I had 11 Roselines full grown in a client's 350 Gal, they took over the tank and bullied every other fish. They were like larger SAE's that got fat and lazy.
Even a tank that size, they seemed crowded. They were the same size as the ones at Albany Aquarium had for awhile.
So what is the plan for the plants in the front of the tank? E hydropiper can be brought back.
E triandra is easy and would balance and fill the tank in rapidly, nice very bright green.
UG is another nice option.
H araguaia around the rocks as mid ground(this plant can handle being shaded some) and nice bright green foreground would contrast well, then some ferns etc over the rocks etc........some nice brighter color stems in the rear.