From that pic he does look a lot like a Medinai...at least the pics I've seen of them, unless all the one's I've seen are Complex Forms of a Spilo. The red around his/her throat is very dark like the pics I have to compare it to. Either way its a good looking fish.
thanks guys, and rosecityrhom like you meantioned the piranhas that we have known as S. Medinai in the hobby are actually S. spilopleura complex forms. I thought i bought a medinai but i don't feel let down because it's a nice looking P.
The danio isn't fast enough to outrun Munen. I had 4 in there and he ate 3 of them and bit the tail off of this one, however he decided to leave it be and its tail has grown completely back and has been untouched for 3 weeks now!
check my newest post for the size answer, as for the photos i think my girl's camera isn't that good, but the newest one i took was with my roomie's and it rules!