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Some technical comments may be helpful.
The water tank is made of black plastic, which, with the flash used, gives a pleasing black background. A less-contrasty effect might be obtained in a natural pool or an aquarium.
There was no point in trying to photograph these larvae unless they were at, or very close to, the surface. This is because the water had a lot of suspended matter from decaying wood. There would have been a lot of reflection/diffraction off that material.
When larvae actually touched the surface they distorted the surface film, often with one or more meniscus at the interface, usually forming bright highlights around the larva. This would have been problematic for daylight shots but the flash seems to have overcome this effect.
If you disturb a larva, such that it decends into the depths, it may not come up for quite a while, although it will need to breathe air at some stage.
Harold
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