Use the uploaded padded reef school as the exact locked twelve-fish identity, species mix, count, size hierarchy, palette and premium painted 2.5D material reference. Create one uninterrupted five-second reversible calm formation-breathing half-cycle on the existing pure black #000000 matte with a fixed camera. Every fish keeps the same readable side-facing direction for the entire shot. The school stays centered and never traverses the frame. Animate continuous small tail beats and body flex at offset phases. Let only the spacing breathe gently: two rear fish rise slightly, the middle opens by less than half a fish body, and the delayed adjustment travels backward through the group. No fish turns toward camera, changes direction, swaps position or crosses another. The motion must remain natural backward. NEGATIVE PROMPT: No background, camera movement, zoom, cut, frame traversal, group turn, U-turn, direction reversal, front-facing fish, rear-facing fish, edge-on fish, circular orbit, schooling vortex, position swap, fish crossing, count change, duplicated, merged or missing fish, identity or colour change, frame-edge contact, cropping, opacity fade, ghost, crossfade, morphing, blur, freeze, text, logo, UI or reels.
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