Hi,
What tetras are they, do you already have corys or are you asking if they are suitable? For a 10 gal tank the best corys would be one of the dwarf types (c. habrosus, c. pygmeous, c. hastatus) as you will have more room to fit a suitable size group. If you want a single feature fish a dwarf or honey gourami would be a good addition.
Emma![]()