Great! I love these fish! I'm also new to MFK. I have one now probably 5-7 inches long. I've had him for about a year now. Such cool fish to have! I feed him a supplement of Hikari Carnivore Pellets. He loves 'em! Once a week I feed him 10 rosy red feeder minnows. Don't get feeders from walmart, not healthy. Also, no goldfish. I know you see the vids on youtube of the piranhas ripping up some goldfish but goldfish are fatty and don't have much nutrients and protein. I go with the rosy reds. Anyway, I hope you have alotta good years with your RBP's!