Hello, I have decided to go with a black piranha. I have a tank that is over 100 gallons, I am not sure how many gallons it can hold, but it is 6 feet long, 22-24 inches tall, and 18 inches wide. I was wondering if this it big enough to raise a black piranha for it's whole entire life. If it isn't I may be forced to change my mind. If there is anything you would like to tell a possible new black piranha owner, please do. I just need the minimum tank dimensions now to make the full decision. I have also noticed that sometimes full grown black piranhas develop bumps on their chin, or in other places on their body, I was wondering what this might be? The more information provided, the better. Thank you.