These are important things you should remember if you would like to buy some new bettas.
Behavior: You want an active fish, floating upright, not spending too much time in the bottom. If a betta fish is motionless it could be sleeping.
Fins: The fins should be open and smooth withot tears, and spread fairly instead of clamped together.
Scales: The scales should be flat and smooth. They shouldn’t be loose or peeling.
Gills: Make sure the gills are smooth, not red or stringy.
Eyes: The eyes should be clear and not be bulging or sunken.
Belly: Should be think and not bloated.