Photo shows one of the other males which wandered too close to the breeding pair: he tried to have a closer look at the eggs, and the pair were not having any of it.
As always, the eggs were gone once lights went off, but I do plan to attempt breeding them in a dedicated aquarium in the next few months.
The loss of the last spawn, from this pair, which took place in the community aquarium resulted in the aggression between the pair and the other two males and required the removal of the pair into other accommodation. It looks like the 5 ft, 150 cm, aquarium is just big enough for the four to stay out of each other’s way.
Temperature is currently 26 °C.