Its worth mentioning that the reason strong light is associated with red color in plants may be due to a shortage of nitrogen (caused by higher growth from higher light) causing a lack of green pigments & permitting the natural red pigments to be more visible. Dark pigment adaptations probably result from plants evolving protection from UV present in strong sunshine. Red plants in our aquariums typically would grow emersed under natural conditions. You can actually grow a number of terrestrial plants under water if you have CO2 supplementation. I've had lawn grass sprout & grow completely under water. Steve P ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/