No, Picassos and Nigers won't work together. I had a Picasso, had to sell him when we moved. Once back into the hobby I got a Niger. They are very trainable also, mine easily ate from my fingers (and didn't miss) Recognizes you instantly and will be at the top of the tank before you blink if he spots a container of food in your hand.
Mine was a bit weird though, he use to watch TV...particularly if I was watching something about fish, especially JAWs.