Betta is naturally aggressive also called fighting fish. Things you can do is to observe the behavior of betta to determine their health and emotional state.
How to tell if my Betta fish have produced eggs - Quora
How to Determine the Gender of a Betta Fish
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29 Types of Bettas: Tails, Colors & Patterns (With Pictures) – Petnanny Store
Betta friends, is this a swim bladder issue?? : r/bettafish
How to tell if a betta fish is stressed or angry - Quora
29 Types of Bettas: Tails, Colors & Patterns (With Pictures) – Petnanny Store
Help with severe fin rotUpdate
What is the Normal Betta Behaviors - Hygger
What Fish Can Go with a Betta in a Fish Tank - hygger
Why Is My Betta Fish Not Moving – Petnanny Store
Why is my betta fish slightly puffing his gills in and out when he's resting (or just not moving)? Is it hard for him to breathe? He is in a filtered and
Why is Betta Fish Flaring Its Gills and Fins - hygger
What is the Normal Betta Behaviors - Hygger
10 Signs of Happy Betta fish