Hi, I have had my CPDs since Spring 2007, and they live in a 48l community tank including a trio (one male and two female) of Siamese Fighters, who were added later on. My male fighter is very peaceful and has never paid any attention whatsoever to the CPDs, which are very happy and have bred in a partitioned section of the same tank. I’m currently cycling a new 48l tank as a species/breeding tank for them.