I'm a teacher building an aquarium-animation lesson for my students and need a previz based closely on this reference, so I can discuss staging and swap angles later. Recreate multiple orange goldfish swimming in the blue-lit tank, with the aquatic plants, driftwood, bubbles, and surrounding environment matching the clip. Keep the fish poseable for later edits, and match their tail-driven swimming, passes, timing, reference framing, and camera movement. The priority is tail motion, foreground/background depth, and underwater blue light. Keep materials and lighting faithful; minor details are your call. Deliver a source-length render, about 2.6 seconds, as a 3840x2160, 30 fps H.264 .mp4, plus the editable Blender .blend project.