Serrasalmus Rhombeus is a common piranha, probably second only to Pygocentrus
Nattereri (Red-Belly piranha). It is a relatively slow grower after 5" More info will come
shortly, but I am feeling lazy right now.
I Picked up a large rhombeus a few weeks ago and it is adjusting well. It is currently housed
in a 75g, but it will be in a 125g after some tank shuffling.

A 10.5" specimen I also have. It is currently for sale. Email me if interested

An Araguaia Rhombeus I used to own. Great color on this fish