Got a 3" Tig about 3 yrs ago, currently 19", fed almost exclusively Hikari Massivore daily (6-10 pellets) until a few months ago, now it eats every other day. Lives in a 170G, 24" wide with many other bottom dwellers.
7 x Clown Loaches (6.5"-9")
10" Ansorgii bichir
Many Datnoids, a couple of cichlids, 8" Fei Feng Flatail.
The Tig primarily hangs out at one end of the tank, chasing others away but without biting. But, roams around the tank a lot at night since its nocturnal. Its doing well, but the truth is, the tank is too small. I've seen the combo of armatus, arowana, and rays together with a tig in many vids, but you'll want a much wider tank if you are going to raise rays. Good luck, hope this helps.