I had a male dwarf gourami once, and believe me, it teared apart almost all my other fishes in a 20g water tank with good water parameters. Sadly then I had to return him. Once in a while you would just get a rouge one.
For 10g there are a selection of tiny tetras like embers tetra but you need at least 6 of those which is fine cos they stay really tiny (2cm max size). Otherwise a single betta is beautiful in any tank. A male colorful betta will not bother any other fishes besides it's own kind.
For 10g there are a selection of tiny tetras like embers tetra but you need at least 6 of those which is fine cos they stay really tiny (2cm max size). Otherwise a single betta is beautiful in any tank. A male colorful betta will not bother any other fishes besides it's own kind.