The cement blocks that I placed into tank no / 3 have been accepted as a suitable breeding place. I have seen fish in them and it is my opinion that they are getting ready to breed in the hollows that I created with the blocks, you have to sneak up at night with a torch and you will see this behaviour, in that sense they are truly nocturnal all of the important things are done late at night.

I am going to see if I can catch a female laying her eggs on camera this will be tough they may perceive the camera to be a threat and push it away or go elsewhere to lay the eggs but I will give it a go.