Hyperfantasy cosmic river, **realistic Betta splendens in dynamic motion**, **Fish movement**: (S-shaped body undulation:1.5), (flaring gills:1.3), (veil tails billowing in cosmic currents:1.6), (directional thrust from fin movements:1.4), **Action details**: - Betta propelling itself toward crystalline asteroid (left frame) - Second Betta mid-turn with (spiral motion blur:1.2) near nebula cloud (right frame) - Third fish arching upward with (water-like resistance trails:1.3) **Environment**: Fluid cosmic space with: - (Swirling quantum vortexes as "currents":1.4) - (Floaming neon coral reefs:1.3) - (Planets with liquid cores creating gravity wells:1.5) - Bioluminescent stardust coalescing around fins **Technical**: Motion capture realism, time-frozen action shot, 8K resolution, Unreal Engine 5 fluid simulation, subsurface scattering on moving fins --ar 21:9