Hey I made this for people that get dull colorless fish for there Betta tank.
My bettas are big tailed devil butterflies ( new breed ) and two veil tailes and they are very warm to other males ( exept for shark my veil tail he is mean) I got mine from a breeder in (exept for the viel tails) so I have a father and son in the same tank with male guppies and they are nice and friendly with all of them. Don't try this unless in the first min or two they are in swimming terms bettas have different personalities some are jerks like shark ( my mean Betta ) some are kind like bubbles, squirt, Missy,red, and happy

(the rest of my bettas ) so experiment people don't listen to the care forums that say no colorful fish