I have a Nikon d5500 and a 55-200mm lens. I'm hoping to get pictures like these for a project- my main hang up is lighting? What sort of equipment should I use and are there any specific angles? Thanks!
You want a single broad diffuse source, to the left of the axis, whose centre is level with the centre of the lens and a dark light-absorbing background such as black velvet out of the way of any spill from the light source.
Place your camera (dead-level, use the aquarium water surface as a guide) an inch or two below the level of the surface.
Use a flag to block any light that might hit the background.
Use a big pretty-coloured subject.