No idea, Yobbo cant understand why the little fish are not flaring back at him LOL. He will swim up to them flare swim around flare then swim away with disgust because they will not play LOL.
Mr Yobbo found that if he stares hard at the glass in the back of the tank he can see another betta, And its time to flare and fight. My solution was to line the inside of the tank with those 3d Styrofoam backgrounds.