Hi all, I acquired a pair of marbled motoro stingray pups 5 years ago from a local breeder. Unfortunately, the female passed away unexpectedly a couple months ago. I am now toying with the idea of adding a new stingray to the tank. The boy is currently about 10" disc size, with no tank mate at the moment. How do I go about selecting a companion for my boy? Should I find one that is about the same size/bigger/smaller? Would male/female matter? He's currently in a 190 gal 40" cube tank. Thanks!