'Glass Cats', man.. B) (They look as cool as this guy. No,..cooler.)
Very cool, transparent, fish-firendly! Give them a cave to hide, and watch them fly out like scud missles when you drop food in. Very peaceful, shy, yet cool little guys that don't need that much room (10 Gall may be too small, but not by much).
Be nice and get at least 2!