This is a real story about enemy anemones:
Wiedenmann, J., Leutenegger, A., Gundel, S., Schmitt, F., D'Angelo, C., & Funke, W. (2007). Long-term monitoring of space competition among fluorescent and nonfluorescent sea anemones in the Mediterranean Sea. Journal of the Marine Biological Association of the United Kingdom, 87(4), 851-852. doi:10.1017/S0025315407057050
The competition for space among fluorescent and nonfluorescent Anemonia species was monitored in the Mediterranean Sea in order to see whether the fluorescent species A. sulcata var. smaragdina was a better competitor in shallow water habitats. Over a period of 11 years, A. sulcata var. smaragdina convincingly out competed the nonfluorescent A. rustica. We thereby found support for the notion that the GFP-like pigments may increase competitive ability in anthozoans.