Cacatuoide male post spawn

[Boltons1]

Hi, my male has had a successful spawn and now is at the bottom of the tank looking colourless and very still but is still breathing and swimming every now and then. Never had this before?

He was so robust before the spawn. He was the dominant fish in the tank before the spawning.

What could be the problem? My readings and tank parameters haven't changed for weeks. However I am due another water change on Tuesday of 20%

 

[gerald]

If both parents are still in the tank with they fry, is the female attacking him? Some females allow their mate to stay around the fry, others consider him a threat and will attack him just like any other predator that is too close to her fry.