Help! Setting up and stocking a 150gal tank

[outback kid]

G'day just wondering I'm looking at stocking a 150gal tank I want a catfish that is very much like a red tail (I no red tails are to big for a tank this size) but what are some catfish the same as red tails the only grow to around 50cm.

Also any idea on what nice big fish can be stocked with. Thanks !
Tanks 5x2x2ft

 

[Delapool]

What about clown loaches? Not really a catfish but close.

 

[outback kid]

Hmmm maybe, thinking maybe a salmon tail, or something. Going to be American cichlids tank.