i just started a new 20 gallon fish tank and learned about the cycle thing. I haven't bought any fish yet but I have looked at a few. I let the tank run for about and week now, but got a little bit impatient and thought hey, how about I just buy some fish that would be able to survive the cycle and that way I don't just have an empty tank. so I researched a few fishes and here they are "platys, dwarf gourami, julii Cory's, Pygmy Cory's, and celestial pearl danios". I know platys could survive the cycle but what about the others? I also know that I shouldn't put in too many at a time so I would just get one spices at a time.