Thinking about going aggressive on one tank?

[TurboRobert]

So I have upgraded my reef recently and went with a bigger tank. I was thinking of making the smaller one an aggressive tank. I have a 50 gallon with a 15 gallon sump. What kind of fish can I fit and should I take the live rock out or what. Also could I leave some of the fish or corals in the tank?

 

[mongerman]

Dwarf lion and snowflake eel

 

[aquaman67]

Put the corals back in the 50 and make the 125 the aggressive tank. (J/K)

A flame angel would be nice in an established tank and any corals it bothers could be moved.