i dont think natural behavior is stressful. especially if it ends with no fighting. we coddle our bettas too much. often leads to problems.
cheers
cheers
There's is no need for it at all.
need, maybe not. but i do think its beneficial. most bettas live in small, poorly decorated tanks without tankmates. occasional flaring gives them some stimulation and can keep them interested in their surroundings.
How do you know that flaring gives them stimulation and keeps them interested in their environment?
There is nothing scientific about it.
If you don't think it's doing any harm (causing visible stress, for example), then whatever really. You're never going to get any solid evidence either way, and plenty of 'well I do this and my fish does this' accounts for both beneficial and stressful.