The tank is too small for the parrot why not trade it in at an LFS and get some new fish or equipment? Id personally set that up for some nice tetra and cats, e.g. some scissor tail rasbora or Rummynoses with a few nice corys like Sterbai or Adolfi.
I agree with Lupe, I keep some and my largest was only 5"...
What scissortais do do however, is get bullied by bossy fish and they also can die for little reason