An Oscar will grow quickly compared to a sen. If you buy a small oscar at lets say 2" and a sen at 4", your oscar may put enough size on in 3-4 months that it could decide to try and eat that sen. The sen just will not grow fast enough to keep up. If you can get a bigger sen then the worry is a bit less. My suggestion for an Ornate or endli was because these would likely keep pace with the oscars growth since they are both known to grow fairly fast. And with a 132 gallons you could keep a bigger poly with that oscar.I dont see how would oscar eat senegalus
Sens don't usually get big enough to live with an adult oscar. Teugelsi, ornate weeksi if purchased at larger sizes. LikeI dont see how would oscar eat senegalus