Not now, but a little later they will be.....as for the 3ft Pacu, I don't know a lot of places besides huge businesses or malls that will take a pacu that big. And who is requesting tank size be 1500 gallons? That is such a hard sell.....
Once your pacus grow, even if you get your new tank it will be crowded....we only have 2 blacks in ours, and I wouldn't put any more pacus in there....