My Channa Stewartii pair fighting

[Rosendal12]

Hey guys.
I really need some advice about my Channa Stewartii.
I got them about a month ago from an experienced snakehead breeder who wanted to focus on other snakehead species. My pair already have 4 babies about 3-4 month old. Suddenly one of them started chasing the other around bitting it. Like loud snaps. It has lost alot of scales. I did a good water change and moved the babies to another tank to themselves. Could this be one ready to mate again and the other not? Or could it something else?

 

[Rosendal12]

Anyone with knowledge of this kind of snakehead, please help. I'm in great need of advice!

 

[m.hiko]

If i were u i will put a divider, i lost my female channa pulchra,3 days after releasing egg...
Normal for channa even a pair turn on each other, especialy after water change, water change can trigger breeding and figh too...
Put a divider