The male veiltail betta is known to be mildly aggressive, though not as aggressive as many other betta varieties. It is in his nature to turn on other fish of the same species. This is why bettas are often also called Siamese fighting fish.
Are Veiltail bettas more aggressive?
Veil tails are not strong swimmers and do best with only a gentle current in their tank. They are not as aggressive as short-finned varieties.
Are Veiltail bettas bad?
Like mixed breed dogs, they often have a pleasant demeanor, are generally healthy and because they aren't heavily inbred, don't suffer from the deformities that some fancy bettas do.