Thats a big tank for such little fellas, I've never kept 'buxar' befor but i'm sure its care is much the same as other Badidae keep in quite a dimly lit tank with very little water movement and plenty of plant cover.
I terms of tank mates think of small peaceful fish i've kept them with cherry barbs and parambassis lala with out any problems.
In a tank that size you could easily keep 10 or so individuals.
Good luck.
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