This is probably a dumb question.. but I really know NOTHING about fish?

Help me!

New member
So my betta doesn't flare at his reflection. I've put a mirror on the outside of his tank and he just stares at it. But then my cat came and he started flaring at her.
Now i dont know if fish know what cats look like..... i mean there aren't cat swimming around in the ocean, so why was he flaring at her?
My cat kind of starting to climb up to wear my betta is. Like stretched out up to him. Its not like she just walked in the room.
 
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