I asked about size because there are all kinds of pacu, some of which are fairly small. I did a little checking, and these are albino Piaractus brachypomus, so have the potential of getting as large as other red belly pacu.
Couple more shots, thanks everyone, I havent had them long so we shall see how big and how fast they grow, but its probobly going to be like any other pacu, eat alot grow fast and gets big haha anyway enjoy the pics