I would think lighting would be the issue. The lighting they received before you was most likely far greater than yours. It may also be that they came from a immersed environment and are adapting to your submersed environment. Could be a combination of both.Both were red/purple when I first got them, the red crispus died off and grew back green, and the rotala stayed purple, new growth was green and then the purple leaves dropped off, what do I need? Its med light with DIY Co2, upgrading them both soon.