I have an irritans piranha in my 75, known as "Prince Charmless".
sadly i cant do any piranha i am in florida in the U.SSerra piranha is the way to go. You can keep any of them for life in a 75g pretty much. Rhom's grown in captivity do not pass the 12in mark so they are safe too. The biggest challenge is that is hit and miss with activity level and aggressiveness.
thank you and exodons are definatly one of my top choices right now
If you are in Florida, wolf fish are probably verboten as well. If you want an aggressive fish, cichlids are probably the way to go. Colorful, intelligent and interactive. Forget about plants, though.sadly i cant do any piranha i am in florida in the U.S
Parachromis motaguensisMale red tiger cichlid