He could be seeing a reflection of light off the surface that imitates a natural prey fish or something. Other than that my only idea would be either too cold or too hot as far as your tank temperature.
He is jumping up at the reflecive guard on the lights.. they're like Mirrors!
He's so much fun! We've been watching him for hours...
I still don't know what sex 'he' is though...
Will hopefully find out when we pair him off.
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