So I came across a good deal on an upgrade to my 10 gallon tank. New tank will be a 40 gallon breeder (roughly 36 x 18 x 17), and aside from having a fun time trying to find the appropriate hood/top all is going well. I will be moving the stock from the current tank, a ten gallon, to the new tank once cycling is complete. So that will be two peppered cory, one black kuhli loach, and three male platy. First thing will be beefing up the cory and kuhli loach to their appropriate numbers. So that takes me through the first little bit. After that is still up in the air. What to add? School of something on the smaller side, a small school cardinal or Neon tetra's? Harlequin rasbora? I'd also be interested possibly in adding Gourami as sort of a centerpiece, preferably at least two which I've understood an be tricky. Are there any species that their size and temperament would make this more workable in the tank? Blue or Opaline? DG (local shops have them in various colors/types)? Honey Sunset? Or am I basically looking at only one irregardless of the type in this size a tank?