i recently was in a rut. i was having many different people telling me that i can only have two happy piranhas, and people telling me i cant. i made the decision to buy the last two from my lfs. Three weeks have passed and they are doing great, they have noticeably grown larger and developing great color.
They are in a 75 gallon, lightly planted tank with a large peice of driftwood to hide under, and a sand substrate. im feeding them frozen bloodworms, frozen omnivore cubes, and once a week a small chunk of catfish fillet. i will post a picture of them when i can.