Should be Rasbora trilineata. Grows up to 13cm total length (TL). No experience with them unfortunately, but Michael does. Here is his tank.
I find that be it rasboras or barbs or tetras, they may seem to be schooling tightly at the LFS but after a while in the tank, they form loose schools instead. Possibly due to the absence of a "predator" and being too comfortable in the tank. *shrug*
2000+L is a huge tank! Consider Puntius denisonii too, which grows to about the same size, should look really nice.
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