I haven't made much more headway with this, but I have most of the plants I want to use going pretty good in a growout setup. I rounded up a few old photos to explain some of them.
The 29G is 30" wide, so I can fit seven of the riparium planters inside. Most of the planters will hold crypts. I have discovered a few different crypts that grow especially well emersed in riparium planters.
Here is Cryptocoryne wendtii
'Mi Oya'. This plant gets awfull big and I had this specimen in a 55. It might work to use one of these in this 29 if I trim it back.
Here is C. wendtii
"hybrid". This one is really cool with its white variegation, but I think that I don't have it anymore unfortunately.
'Tropica' is a nice size and shape and it gets an amazing bronze luster when you grow it emersed.
is my favorite for growing in riparium planters. In contrast with the C. wendtii
varieties, it is more sturdy and stands up better. Notice the yellow spathe tongue down near the crown of this plant.