stanny,
my males hardly ever fight, they sometimes flare at each other over algae wafers but both my males take it in turn to fan the fry in the luv shack shell...lol
I have to say I have heard this but never seen it!
if you can film the change over shifts that would be a sight to see plus how do they change ?
this is very interesting only because i know my male and he flars up at me lol