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If the tank has been up for a week are you sure it's cycled?
I have Pygmy and hasbrosus Cories as they are much smaller and a better fit in a 10 gallon. Male Endlers or Dwarf Panda Guppies (much smaller than regular Guppies) are another option as a companion fish but they are a bit "busy" and prefer cooler temperatures. I have 10 Neon Tetras in a heavily-planted 20 long with Archibald and there's not been a nipping problem.
I have Pygmy and hasbrosus Cories as they are much smaller and a better fit in a 10 gallon. Male Endlers or Dwarf Panda Guppies (much smaller than regular Guppies) are another option as a companion fish but they are a bit "busy" and prefer cooler temperatures. I have 10 Neon Tetras in a heavily-planted 20 long with Archibald and there's not been a nipping problem.