I have a 180g with quite a few Vieja, GT, and Escondido, and I had a Salvini in there too at one point. I would be careful about the Salvini. In my experience you'll probably want to get a much smaller Salvini than anything else. Mine was an absolute nightmare. He was the smallest fish in my tank and ran the show without question. I had to give him away because he was attacking 24/7. He wasn't even protective of an area of the tank, the WHOLE tank was "his tank".
If you decide to get some Vieja, I would be looking to upgrade tank size in the near future. Some of the larger species of Vieja can get 18". I have way too many, and need a 300-ish gallon now to accommodate them. Some of them grow absurdly quickly too. One of my Bifasciatus went from about 1.5" to a solid 9" and thick in 9-10 months. Your best bet will be to raise them all together from a small size. Even then some fish will never get along.
If you decide to get some Vieja, I would be looking to upgrade tank size in the near future. Some of the larger species of Vieja can get 18". I have way too many, and need a 300-ish gallon now to accommodate them. Some of them grow absurdly quickly too. One of my Bifasciatus went from about 1.5" to a solid 9" and thick in 9-10 months. Your best bet will be to raise them all together from a small size. Even then some fish will never get along.