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dabombguyman - I'm not sure I understand the first part of your question. The edges of what?
Regarding shadows, yes the fish in 3.0 will eventually have shadows. In previous versions the fish never got close enough to the gravel to worry about shadows, but in 3.0 they will be able to skim the floor looking for food. The shadow would fade out quickly with height above the floor. If you look at a real saltwater tank, the lighting is extremely diffuse, so the fish cast no shadows once they are about an inch off the floor.
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