That tank looks like a party I don't wanna go to: all males.
Balton, the big festae were all sold and killed by people, like myself, who acted rashly when the price of these fish skyrocketed. Wild Ecuadorians were everywhere, then gone. Watch the same happen with the Peruvians 1-2 years from now.
I will say this though, I wish I had never sold my group of 5 f0's. I had a pair forming, possibly 2, in a mixed species tank. The largest was around 9-10 inches.... My mood is changing as I type, lol.
The worst part is, I NEVER put them alone (amateur move I know).
But, as anyone with big wild festae knows, the offers keep coming and it can be very difficult to hold out forever.