My male and female krib have had several large spawns, not too long ago she decided to go on an aggression spree torwards the male. I have not had any spawns since, however she still curls her belly torwards the male... but man is she a meanie. *crosses fingers*
Personally, with angelfish, I find every so often the rotation of mates seems to help aggression on particular fish.
Best of luck!
Regards,
Raithan O. Ellis