I have a 180g thank with a 2ft black arrowana, 18in Tig, and 2 marble montoro rays. My ? is would a 12 in Florida gar work in my
set up. Will be moving fish to a 250 gallon tank.
The catfish might out-compete the gar for food or even try to eat it, and the rays might get torn up by the gar & may try to eat it if there's too big of a size difference. Of all of the fishes that you mentioned, the rays have the largest chance of working out.