Here's a picture (by Mo) of a male that we collected near Bella Union in Uruguay. He placed second in his class at the ACA last year to an amazing Krobia
. He's really unhappy in the hard, alkaline water...
They get to about 6" and then really start to bulk up.
Acara fill a similar niche to chanchitos in the ecosystem. Where we found acara we didn't find chanchitos (and vice versa). They'll eat small fish in a minute.
I have a group of 5 that we collect from Constitucion growing out with a 3rd wheel chanchito...and it's an uneasy back and forth. Sometimes the chanchito tries to take over and sometimes he's hiding behind the sponge. I have my big one and his mate divided and with some Uruguayan plecos..
Matt