He wants her to spawn again. You can remove the babies, but he shouldn't be too much of a threat to her unless you have a really dumb male. My male does the same behaviors to my female too, but I have never even seen her get a torn fin much less an actual missing scale.Ok. Spawn still all well and growing. Managing ok so far. But big problem is male has turned on the female. She hides top of tank and gone really dark. Really worried. Should i remove her?.
It may look violent to you, but I think he knows what limits NOT to push and what lines NOT to cross. This is millions of years of evolution - they do this and have been doing this in the wild for millennia, it's just that they have more room for the female to get away from the male, so MY advice would be leave the fry where they are and move the PAIR to bigger tank.