piranha help

Guys, I bought this guy last November. I have no one in my immediate vicinity who has experience with actual piranha. So, I'd just like to ask those who are here if my red belly looks healthy. I feed him northfin pellets, prawn, ladyfish and anchovies along with hikari carnivore. Just want to...

Hello everyone, I currently have 7 Red Belly Piranhas in a 75 gallon tank, all around 2.75 inches in length. I've recently experienced some fluctuations in the Ph in the water. I could tell that all of them were becoming more stressed/looked more lethargic, as well as stopped eating as much...