i have a 20cm silver aro in a 4x2x2 his tank mates are 13cm silver dollars,7cm albino shark,6cm red tail shark,large angels & 8cm tiger oscars,i have never had a problem with aro being aggressive..
now i decided to sell angels,oscars,sharks,

so now i have with my 20cm silver aro 2x13cm silver dollars,2x8cm archer fish my silver aro has become extremely aggressive & will attack anything in the tank...
i am thinking maybe i should put my 2 tiger oscars back in tank as they showed slightly more domination when they were with silver aro.
any sugestions would be appreciated

chris sydney australia