My tank is a 10 gal. planted tank. I've decided that I want a Betta Imbellis, aka "Peaceful Betta" and some Dwarf Croaking Gouramis, aka "Sparkling Gouramis." (Are both those names accurate for the Dwarf Croaking Gouramis?) I know I have to choose one or the other between Cories or Tetras but I can't decide. I also need to know how many of the grouping fish (Gouramis, Cories, Tetras) I have to get to make sure that they are happy. Please help me. I don't want to overstock but I don't want to skimp on friends for the grouping fish.