i would keep the fish breeds small as they would make the tank look larger (and you can get more
)
first if you are running co2 then look into dirt substrate (absolute dream and the plants will love it) then with the light blah - plants will determine what you can get.. but what i would get/do is:
dirt substrate with black gravel cap
(50-50 as they'd like to grow on the plants, so this is a maybe) moss wall on back and sides of aquarium (front has none as you would want to see in the aquarium
)
crockscrew and normal valls all along the back of the tank.
have rock/wood centerpiece at 45 degree angel near one side of the tank or slightly off from the middle.
the assorted swords around back/side of centerpiece.
then have ruffle sword somewhere at back.
water wisteria at back or side area.
you can either have the centerpiece bare or have Anubis on it.
crypts to side of centerpiece.
then at back you can (depending on light) put red lotus.
then front i would have dwarf hair grass and let it spread.
then allow everything to grow and root (co2 won't take long) then do a fishless cycle and have
red fire shrimp (or cherry) you can have 10 per gallon, but they breed past so watch out
some type of yellow/orange/blue shrimp
a school of 10 galaxy rasbora
(when the tank is fully mature) have 6 otos (great for algae)
then for center piece fish i would have a elephant ear, dragon scale beta. i know eh a beta, but i think that with everything the tank would look really sharp.
that's what i would do
but it is your tank, so post pics when you are done