Originally Posted by fishfinder

I'm assuming that the picture only similar to what you have in your tank. Chickadee is right, PK stands for plakat. (sorry I missed the PK) And it is best to remove your betta guarding the nest right away. Either way, a plakat male or overly agressive female is a threat to your other tank inhabitants. Can you get pics of the actual fish? My curiosity is kicking in now. I still find it odd that this problem only popped up recently after being together in a tank for a year.