In pond mode, do we currently have "shadows"? What I mean is, if there's an algae, will it block light from reaching the algae below it? If we don't currently have this feature, I think we should implement it, because this should encourage algae to evolve into "plants" with leaves, etc... as they strive to increase their horizontal surface area while trying to stay on top of the other algae below them. This is how complex plants developed, right? Just a thought.