I.D. Needed please help

[motorohorn]

hello.. what kind of sivler dollar is this? (not the blackbars) it looks a little like a pacu in the pics i know but i am sure it isnt. what size will this fish get? also the blackbar dollars i have had many diff people tell me many diff sizes. how big will they get? they eat lots of veggie pellets and sometimes bloodwarms and shrimp.. is there more i should be doing? i have had regular silverdollars for years but im pretty sure these ones get alot bigger.. any info counts thanks

 

[brcacti]

according to fishbase the black bars can get to 42 cm thats well over a foot long, I have heard the blue fin black bars get larger then the red fin type but dont know from experiance, my 3 blue fin black bars are about 9 inches with fins long and 7 inches with fins tall right now

 

[motorohorn]

the pic of the fish dosent show the redish blueish tint the whole fish has thought i should add that

 

[motorohorn]

and i could really use an I.D. on the fish in the first pic.....

 

[Kyle_91]

honestly, it looks like a female red-belly pacu... thats just my 2 cents.
and about the feeding: frozen beefheart and krill always satisfies them.