Th:
That tank is very, very nice!!
You did not indicate and I cannot ascertain from the photograph of your tank if your "skirt tetras" are black skirt or white skirt.
If black skirt then 5 Cardinal Tetras might look nice.
http://www.aquahobby.com/gallery/e_C...n_axelrodi.php
If white skirt then 5 Serpae Tetras might look nice.
http://badmanstropicalfish.com/stats...aracins2e.html
TR