90g Kribensis Biotope

[Arget]

I've got a 90g tank that I'm planning on stocking with Kribensis and Congo Tetras. It'll have areas of driftwood, cichlid stones, and live plants. What live plants would be best for the background, that are low maintenance, and preferably biotope? How many Congo tetras should I stock, I plan on getting a dozen, or would I need more or less? Would I be okay with one pair of Kribensis, or would another pair be okay if there's plenty of hiding places?

[Amazonian]

There’s enough floor space for two pairs but it all depends on if you’re putting other bottom dwellers in or not. They’ll be pretty territorial to anything on the bottom. But it is enough space.

[Arget]

The only other bottom dwellers I plan on is MTS, Ramshorns, and Assassins. MTS to help stir the sand, Ramshorns because they've infested the tank to the filter, and Assassins to help keep the Ramshorns under control.