Hah here u go I myself and getting a tank like this 8'x4'x2' and will be doing this combo
2 silver arwoanas ( they havent fought for over 6 months and i've had them sence 4" )
1 red oscar
1 red tiger mota ( will be food soon enough )
2 oscell Pbass
1 clown knife
1 16" royal pleco
1 lima
1 channel cat
1 bullhead
They are all under 2'ft mark and in my 360gallon right now and would live fine fullgrown but i'm gona put them in the bigger tank.

If i was u i would do this
1-2 silvers or blacks ( either or )
2 golden sunshine oscars or blood red oscars
1 clown knife
the clown loaches will probably be fine if u put them in first and have all the monsters growout and be friends with the clown loaches ( LOL! ).
You could probably get away with a couple more things.
2 silver arwoanas ( they havent fought for over 6 months and i've had them sence 4" )
1 red oscar
1 red tiger mota ( will be food soon enough )
2 oscell Pbass
1 clown knife
1 16" royal pleco
1 lima
1 channel cat
1 bullhead
They are all under 2'ft mark and in my 360gallon right now and would live fine fullgrown but i'm gona put them in the bigger tank.
If i was u i would do this
1-2 silvers or blacks ( either or )
2 golden sunshine oscars or blood red oscars
1 clown knife
the clown loaches will probably be fine if u put them in first and have all the monsters growout and be friends with the clown loaches ( LOL! ).
You could probably get away with a couple more things.