[HELP] potential tank mates for beast senegal

[lobak merah]

I got 1 sen that is pretty aggressive, she's only 4 inch but she attacks my other sen which is 6 inch long, she even killed my 6 inch endli!! Now I left her alone in tank, I want to add some friend for her, but I'm afraid she will attack and end up killing her tank mate (again). What would be the best tank mate(s) for her?
Reply are appreciated, sorry for my bad english

 

[Darth Scohin]

We need more info what size tank what filtration what decor and how do you define attack? I know my Endli will mock charge other polys when she gets uncomfortable

 

[lobak merah]

My tank size is 40 gal, with no decoration, just soft sand for substrate. When she attacks my 6 inch sen, she chases it then bite it's fin or tail and leave some bite marks. I fed her regularly so that she will not get too hungry to eat fish that is her size or bigger.

 

[GarNiac]

use this,
http://www.kaskus.us/showthread.php?t=955675&page=259