The grassy, stiff leaved plant in your second tank looks like it might be Ophiogon which isn't aquatic.
If it is Ophiopogon it will have very stiff leaves, if it is Sagittaria or similar it will be lot more floppy.
A paper has come my way that I thought might be of interest. : <"Photosynthetic acclimation of terrestrial and submerged leaves in the amphibious plant Hygrophila difformis">.
It is "Open Access", so should be available to every-one.
It is quite interesting, it suggests that ethylene...
I was in Lidl this afternoon, and they are selling some quite large Maranta and Calathea plants for £2.49. They would be good for a large open top tank with emersed section.
You can see them in a few peoples tanks, this is one of "sciencefiction's" from this post...
I've got quite a bit of Utricularia gibba, mainly because once you've got it, it gets everywhere. I quite like it and it grows well, but it doesn't usually flower. This bit hitch hiked its way into a plastic tub in the glasshouse, with some spare "floaters", and I noticed it was...