The two shown below staged a one-hour fight on the front glass, rapidly circling each other and occasionally overlapping. The participants are probably the largest female and one of the smaller males.



No idea if this was a fight (they usually don't argue over the place on the tank wall, only quick arguments over stones), or something sexual?
Toward the end of the fight, the underneath of the female was reddish; the male unfortunately broke off, ran to the other corner of the tank, and was too exhausted to hold on to the glass -- he was sliding down. He is sitting in the corner recovering now.....
Weird.... This did not happen before...
And to make it more weird, there are now different two, doing the same thing on the driftwood.