How to add more fish, remove Oscars?

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Hmontoya93

Plecostomus
MFK Member
Jun 18, 2020
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I have a large 8 x 3ft aquarium with one 6 inch Oscar, a6 inch red vieja 18 inch arowana and Florida gar. I wanted to add a couple more cichlids because it looks empty but the Oscar and red vieja go nuts at any attempt, they were previously ok with Severums datnoids and green terrors.
Should I take out the cichlids and restart with all juveniles?
 
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