Welcome to AA fishphenome.
How much ammonia did you use to cycle the tank? I'm asking because if you used a lot than you'd have enough bacteria to process your entire tank's bio load, but if you used only a little than you don't have that
much bacteria. So, IMO
, that's really your deciding factor.
My 6 tetras get along fine w/ my dwarf gourami. However in the begining they chased him around a bit, but nothing too aggressive. Although I've recently noticed he's missing half of one of his "feelers". I don't know how that happened.