thanks for sharing the though, well answers, I always wanted to have black piranhas for my tank, however they are no that easy to find them in the shops over here, I saw 3 of them on display before, they were huge, around 12", but I was to late, they belong to some other customer who bought them first, oh well then, I bought 12 juveniles red bellies instead, with a very very cheap price,
they live well in the pond; and just after 2 days ever since I moved them into the pond, they had their first meal. Well I guest I'm just gonna wait till they get bigger, then I'll move them into a huge tank,
I heard fish grow faster in the pond compare with keeping them in the aquarium.