Anyone have experience keeping these fishes..I have four..They are not redtail Brycons where the back of the tail is red but it is black..I got them to shoal, the four of them..They need dithers/target fishes in the tank and they would not mess with each other..I had the 4 Byrcons alone before, and they were trying to kill each other off but when I added some dithers, they now shoal..Very nice looking fishes..