Having kept planted tanks for a while (and generally enjoyed what looks to be a jungle since I am bad at trims / maintenance) I am astounded at how beautiful your FIRST planted tank looks and as someone mentioned earlier, had I not seen the dollar bill I would not have realized how small the tank was. Absolutely beautiful.
I might consider CPDs/Galaxy Rasboras (whatever they're being called at the LFS now...) just given the size of the tank and I think they're beautiful little fish. I just saw you mentioned them as well and I think they'd be great in that tank.
Also, I used to keep Espei's Rasboras and they are beautiful fish when they settle in, with an electric but asymmetric orange band on them that's captivating. Underused fish IMO. I'd consider those as well.