Predation hasn't been bad at all. Every now and then, something will get popped, but it happens with big set ups like this no matter what you do. All of the big predatory fish are used to hand feeding, so they wait to eat.
As for the breeding, we've seen a lot. They started pairing off almost right away. (The black pacu even spawned in holding!) If it is a species we are trying to work with, we'll pull the fry and raise them. If not, we'll trade off any that make it to other facilities to keep a good gene pool going.
As for the breeding, we've seen a lot. They started pairing off almost right away. (The black pacu even spawned in holding!) If it is a species we are trying to work with, we'll pull the fry and raise them. If not, we'll trade off any that make it to other facilities to keep a good gene pool going.