With vieja, herichthys, and a few others in a 210 gallon how would the compatibility be do you guys think?

210g 6 foot? Seems a bit short in length with just the RTM, vieja, and hericthys + other 10-12" cichlids (I'm assuming)
Can give it a shot... It's difficult to advise on mixing large aggressive species like this, because it's going to come down to the individual fish. But on average, motaguense are mean s.o.b's. Adult alpha male may not want to share even a 210 gallon. And depending what type of vieja you have, they might not either. If you do attempt it I would have dividers and refugee tanks on hand.
I think long term you will run into trouble.
I also think it's easy to look at a 6 or 7 foot tank and think it's quite spacious, especially when cichlids are added as juveniles.
You did not specify what species of Veija or heritchthys. Both groups of fish have large often aggressive members. If you have a carpintis these can grow around 12 inches and can be mean. One of the most common Veija is probably melanura. Males of melanura can reach lengths around 16 inches and are big thick bodied fish.
Add these to whatever other fish you have plus a territorial parachromis and that tank can start to look mighty cramped.
Your free to try it but I predict it won't last 6 months.