I've never had any issues with care/growth with different colors. I will say that my Aussie neon green wall hammer definitely preferred slightly higher lighting than my purple tipped hammers, but that may have just been because my purple tips had been under T5's for years and got used to a little less intense light. I've kept orange, purple, regular green etc all next to each other on the same level of flow and lighting without much issues. As far as hardiness (because my clown beats the cr@p out of them), the purples and basic greens seem to hold up the best.