As you can see, the betta has flared its gills. I first noticed this when I turned on the aquarium hood light yesterday. This is new. I've had betta before, never one that showed this much aggression. It is a pretty cool sight to see. Right now, in this hexagonal tank, he will react to his reflection to three sides only until later in the night. All the more reason I need to find a setup so that I can watch him all the time by my TV chair.
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