I'd likely get rid of the swords, they will end up looking too large for that space.
You might consider a smaller leaf foreground type of plant.
Also, you likely need more CO2.
Those Dupla 400's do not allow a lot of water through them, so you will need to have some extra flow for the tank and to mix the outflow from the reactor.
They say they are good for larger tanks, they are not, they barely .....well........could not........would be more accurate handle the lower light 125 gal tank.
Even the largest model which is like the Aqua Medic 1000 is barely able to do the job.
Fish cost in OZ is killer.
With good CO2 and current, the plants will be much denser and not so leggy, and the green algae will be greatly reduced, the moss will grow lush and thick over the wood etc.
Check around for various foreground plants, maybe some darker Crypts against the wood, then a nice bright green foreground plant.
That would fill in the space good and make a nice easy to care for contrast.
Fish selection is good, if you have a denser foreground plant, RCS would make it and be able to breed faster than the Apistos can pick them off.