Hi all, this is my first time posting in the piranha forum, mainly a cichlid guy. The reason is I need some advice. This spring I’m helping my cousin set up his first aquarium, he had one when he was a kid, and he wants piranhas. The thing is his local stores are more expensive than ordering online and he asked me for help, since I’ve had fish constantly since I was 8 years old. I had a couple of piranhas (rbp) in a 20 gallon when I was a kid, didn’t go well and eventually we moved to a state that didn’t allow them. I could have still gotten them, just would have spent an arm and a leg. The tanks going to be either 125 or 150. He’s asking me to aquascape it and choose between rbp or caribas. I know caribas are more aggressive and that they look a lot alike, that’s pretty much it. It’s only a few dollars difference so why choose one over the other? I tried looking on YouTube but most of the videos I found were just them feeding or people giving loooong speeches. Thanks.