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There will be a gradient background, and it will not be totally covered. I found early on that the fish need some open areas to be silhouetted against, or they get lost in the detail. This is even more true for the poor little drab freshwater fish.
Regarding moving plants: Yes, there is a difficulty in rendering plants against a gradient background, but perhaps it's not the problem you thought. When the plant is photographed against a blue background, then clipped out in a paint program by turning blue to transparent, the object still has an outline of almost-blue pixels that acted as anti-aliasing. If the plant is then pasted back onto a blue background it looks fine, but what if the background is black? If the background is a detailed picture, a lot of this is masked by the detail, but on a smooth ever-changing gradient, they really show up. On a plant with thousands of tiny tendrils, there can be hundreds of hours of removing these fringe pixels by hand.
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