Aggressive duckling picking feathers, and biting toenails?

[Angelove]

I have 3 welsh harlequin female ducklings (sexed by Metzer). One of the ducklings is very picky and kind of aggressive. She will pick and bite at anything and everything including myself and her sisters. It has stopped being cute and is beginning to hurt me and the other 2..
I have been suspecting that she is pulling out her sisters feathers (she was the only not missing any) which were previously just the fluffy ones that are now molting. I increased their protien, the amount of time they spend outside and their greens..In the past few days I have noticed her sisters scream sharply at times when she picks at them, and today I found a pin feather pulled out on their floor with a tiny amount of dried blood on it. I immediately inspected the two girls who are getting picked on and while I couldn’t find where a pin feather had been removed, I did find that my largested lady is missing half of two of her toenails on one foot..they are no longer hooked and were bleeding..one I was able to get to stop fairly easily, the other I had to hold pressure on with blood stop powder for a good 20-30mins to get it to stop. It appears she also has a very small cut on the middle toe of the same foot...
They are on pine pellets in a plastic tub and the only metal in their home is a baking rack under their water which is mostly covered in a plastic shelf liner and has very rounded edges...
It is possible that the aggressive duckling has some how removed her sister’s toenails?! Has anyone else experienced anything like this?..I have her separated at the moment but they all hate it...is their anything else I can do?..I am beginning to dislike this littlest lady more each day, will she grow out of it? And if so, about when? I don’t like keeping them apart and would like to do it as little/for as short amount of time as possible but I am afraid for the safety of the two sweeties.

 

[swampfox440]

Perhaps some photos would help to clarify . Are you talking about wood stove pellets , wood shavings would be better . I know I would have a hard time walking on wood stove pellets in my bare feet .

 

[Angelove]

Perhaps some photos would help to clarify . Are you talking about wood stove pellets , wood shavings would be better . I know I would have a hard time walking on wood stove pellets in my bare feet .

They are compressed pine shaving pellets like used in horse stalls, when they touch moisture they disintegrate into shavings..I feel like it would be an unlikely coincidence for their to be a pulled out bloody feather on the floor and missing toenails they same day and be unrelated..I read a post regarding chickens where someone suggested that a missing toenail could be the result of fighting, or in this case maybe a struggle because her pin feather was being pulled out..
The picture is of their brooder floor, please excuse the poo.

 

[swampfox440]

Is there a way you could separate her from the others ?

 

[Miss Lydia]

I'd separate but keep them in the same brooder so they can see each other. And then try letting them be together outside where there is room to stay out of her way.
How old are your ducklings? I used hardware cloth wrapped the edges in gorilla tape so nothing would stick them and put newly hatched ducklings on one side 1 week olds on the other. Hopefully you can figure out a way.