were you wanting to add anything else to the tank eventually? any other bichirs, multiple ornates, or other fish in the tank? The reason why I ask because if you just put one fish in, it could become territorial and make it harder to add other fish later on.
A tank with multiple ornates and other lower jaws would be cool. and some swimmers for some movement. Of course, it is up to what you want for the tank. Congratulations on the 170/180g tank!
Beside some dithers for the upper layer of the tank, I for sure am getting a royal pleco and maybe a BGK, but unsure on that as I don't want to get one that always hides.
I also really want some rope fish, but the poly keeping public seems to have mixed reactions on how well bichirs and rope fish commingle before the rope fish become long snacks.