Berlin SwordtailSwordtails are a popular livebearer that is very hardy with an ability to adapt to most water conditions in a peaceful community aquarium. The Berlin variety creates a striking contrast of color against green in planted aquariums with its distinguished brick red and black. Fish Size Guide: The 'Maximum Size' outlined below is the length this fish can reach as a full grown adult. For the actual size please use the select menu above. Discus. ae prefers