So I am a beginner enthusiast and am wanting to start with Piranha. My question has to do with tank size as I hear the more piranha in a tank the better to give them more confidence. But this also means a bigger tank. So I was wondering if I had say 4 fish, how big a tank would I need? I've googled this and it said 60 Gallon for 4 fish. I wanted to ask the experts here to make sure. Will this be big enough for 4 fish? And are 4 fish enough to make the animals feel comfortable?