siamese fighting fish blackOther reasons for flaring can come with when they’re intimidated by movement or change of scene in their environments. Both sexes display pale horizontal bars if stressed or anxious. However, such colour changes, common in females of any age, are rare in mature males due to their intensity of colour. Females often flare at other ladies, particularly when setting up a pecking order. Flirting fish behave similarly, with vertical as an alternative of horizontal stripes indicating a willingness and readiness to reproduce women folk only. Betta splendens enjoy a adorned tank, being a territorial fish it is necessary to establish territory even when housed alone.