Have you had the chance to ID the two Vieja in your tank? Hard to tell due to the lighting and video combination. They are lookers from what I can see.
Two Small No it's a 240gallon with about ten fish or so, The Vieja won't get much bigger and I doubt the Festae will grow anymore. The Midas has more room to grow and so does the shark but with keeping up on water changes and norm maintenance I should be fine. I had a another 240g in the kitchen and that one was over stocked and it ran for 2yrs with no deaths. I guess what I'm saying is as long as you are willing to watch your fish and monitor our tanks and aren't new at this hobby things can go well but there is always chance it can go south in a heart beat
P.S. 12yrs in the hobby and still learning new stuff
I used to have a Male Dovii I tried it in a tank similar to this one and it almost wipe the tank clean over night. To be in this hobby there are rewards and then there are challenges and sometimes you can have both but you my lose some in the end each fish is different and you will never know the outcome unless you try it.