just a pond like BWB's what filteration would i need ?

cheers for the pic
bruce 
and the stock would be :
5xcichla (probley try and get a breeding pair n then keep 3 cichla)
1xsilver arowana
2xtinfoil barbs
1xperruno catfish
1xoscars
1xgraffie catfish
cupple of plecos
1xtsn (mabey)
1xlsn
what would the pond need in filteration i was thinking 1 Fx5 and a large koi fillter 3 300w heaters and a large air pump would that work ??
cheers
josh

cheers for the pic
and the stock would be :
5xcichla (probley try and get a breeding pair n then keep 3 cichla)
1xsilver arowana
2xtinfoil barbs
1xperruno catfish
1xoscars
1xgraffie catfish
cupple of plecos
1xtsn (mabey)
1xlsn
what would the pond need in filteration i was thinking 1 Fx5 and a large koi fillter 3 300w heaters and a large air pump would that work ??
cheers
josh