ray help

[tigrey]

i have a 240 gallon tank and want to eventually get a ray. what kind of ray would best live in my 8'x2'x2 tank? my livestock right now is 5 inch aro, 3 bichirs, lima shovelnose and a gar and fire eel. will the ray be territorial, and is my tank big enough to house a ray for a while. can i keep a ray with my current fish? if anyone can help me that would be great.
thanks

 

[tigrey]

bump

 

[Mobatic]

Ill say just got with the motoro because their hardy and if u want, go on from there.

 

[tigrey]

ok how long could i hold 1 motoro ray for? and will i be able to keep it with my other fish?