a betta fish (long, fringed fins — appears crowntail-type) near the water surface.

Visible items: waterline across upper third, clear plastic tank/divider, small vertical cylindrical device (heater or filter intake) near lower center, aquarium substrate at bottom left, plastic/artificial plant at lower left.
Reflection/duplicate: strong reflection or a second fish image below the waterline — could be mirror/refraction or a separate compartment with another betta.
Background text partially visible: "FSA" (partial letters).
Image: grayscale, vertical aquarium view.