I may be getting a motoro with a 10" disc and I would like to know if he can be kept with my 7" xb aro. Is this a bad idea? 180 gal tank. Ray has been fed mainly pellets with the occasional shrimp.Also the ray comes with an ornate bichir that is 10" that I'd like to add as well. I don't think the bichir will cause any issues but I'm a little concerned about the ray.