They can take a long time. Mine did. They did get going though. They were pretty dominant by tear down. Just remember they're root feeders. That helped me. That means root tabs or active substrate. At least have a substrate with a good CEC. I used two T-8s and CO2. Then dose Macros and Micros and trim and water changes and on and on and on. And before you know it, you'll have some impressive looking Swords.