Thanks for your observations. We as a community know so little about keeping the fila and capa, especially into considerable sizes. That's why your and Vincent's input is so precious to me.
Yea, my capa eats well too (that was in 240 gal) but not growing nearly as quickly as yours. My fila is a finicky eater but has been growing more or less ok.
I agree on the rossiauxii too. I don't think there is one capa or dorado in captivity with a virgin snout.
As for the tigs, mine are still much smaller than yours - 6" to 14" and while I do note an occasional fast, they are not as long as you see. I feed pellets ~ twice a day and fish twice a week. My biggest ones take both. The smallest take only fish and ignore pellets, even though they are from the same "batch". The state of things with my tigs is not as clear cut as I put it but it gives the idea of what's going on.
Oh yea, the tigs are territorial when it comes to their kin or any other brachie. At least IME too and from what I've read of others. Not overly viciously but consistently and persistently. This is with respect to the smaller ones. I'm not sure it carries over into their adulthood because some say they didn't see it with their adult brachies.