A larger tank like this would do better and you'd have more fun likely switching to a couple of beetle like diffusers in each corner.
The ebay Rhinox 1000's would be fine, but if you want the larger 5000's they are good too. Run about 10-20$ ea, nice looking, good as ADA's, get 2 needle valves for each and run them into the return current downward.
That KH suggest you need a pH of closer to 6.0-6.1 if you ask me.
The diffusers suggested above will make things grow better and be a bit easier most likely.
I've never found any need for aeration at night even with large fish loading, some decent surface movement takes care of any of that, we can always add a bit more CO2(you cannot reanimate dead fish though), and if done directly into the tank itself, the degassing issue is less of a problem.
I place a inflow from the return, canister filters(2 would be nice in this tank) etc in each corner and have a hole or two so that the surface moves good and then most of the flow travels downwards at about 30-45degree angle and hits the mist coming up from the diffuser plate so that the mist is well blasted throughout the tank from each side.
This will blast the CO2 in both the dissolved form and the mist form into the plants and slowly rise up hitting the lower sides of the leaves where the stomata are present/where the gas is taken in by the plant leaves.
Works extremely well.