55 Gal For Agressive Tank

[icanfly012]

I have 55 gal FOWLR tank that im upgrading to a 120. I want to use the 55 gal tank for agressive fish. What exactly can i put in a 55 gallon tank and is there anything i should worry about except the food they eat?
Thanks

 

[syndrome]

Depends on what type of fish you want. If you want an eel a golden tail would be very nice. For fish a nice toby puffer of dwarf lion would be nice