08-27-2010, 12:29 PM
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All tetra are shoaling fish which means they live in large groups. A minimum of 6 is usually recommended, although some can manage with 5 if space is an issue. But it is important to have 5-6 of each species. In a 10g you do not have much room, I would suggest not enough for both of the species you have. One or the other, plus some bottom fish like corys which are also shoaling but can be kept in 4-5. The dwarf species like Corydoras pygmaeus would be fine, 6-7 will work in a 10g.
Alternatively, some smaller fish like the dwarf tetra Ember Tetra or some of the dwarf rasbora (Boraras species like Boraras brigittae and similar), or Dario dario or Badis badis or the Celestial Pearl Danio. These are also shoaling fish, but a group of 7-9 of any of them, and maybe two plus the corys, would work and provide more fish and more colour in a small space.
Your water parameters may be important for some of these more than others. You can see the fish profiles by clicking on the shaded names, or using the second tab from the left in the blue bar at the top.