Why do fish do this?

I have seen a male Crosshatch Trigger do this around a tunze. He looks very healthy. I just think they are bored. 58 gallons will never compare to the ocean!
 
Probably a bored behavior, my green spotted puffer used to do it up and down.

Looks like he is trying to get his fastest lap like in mario kart. :spin3::fun4::spin1: (I just felt like using these smilies):lolspin:
 
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