I have the best solution to this problem... get more ducks and chickens and whatever else floats you goat... buy enough where they eat all the fly... its like chicken math LOL im kidding of course
i have welsches and silver Appleyard's. there both quiet ducks. good egg layers. welsch in my opinion is a much prettier duck and more sought out after. my order of favorites are ancona,welsch,rouen,khaki Campbell and cayuga
my opinion very likely chance it just has neurological issues. if it only happens rarely or not a lot i think it still live a happy life. if it becomes more frequent... well that's if it is truly neurological. some smart folks will chime in I'm sure.
my feed mill carries prince foods so i buy it like that. i prefer all flock because i have turkeys and chickens and ducks. just go in ask if they can mix an equivalent ive never been to a feed mill that will not help you with a plan.
they are getting plenty of sunlight right? no shortage of food. no kids chasing them around? stress is huge. its even possible the drake is mating to much stressing them out
for young ducklings i think personally fine wood shavings work the best. can go a couple days without changing and if its outside can stir it up and extend the life some. and doesn't break the bank
i apologize if you took what i said to heart against you. i in no means was saying you meant to or your neglectful. we all have our opinions on things. stuff like this happens and its tough. i personally would rather seperate my males. for a few weeks so ducks can live with ducks its...
i personally would avoid using hay or straw.. when it gets wet it gets slimy.... not bad for the ducks. not so great for us to walk on and or pick up when cleaning. what you have otherwise will last a long time! i mean eventually the poop will catch up depending how many ducks you got.
I personally would put her out there and see what happens. supervised visits one would say all my ducks get put in with the adults at full feathering which is around 5 weeks. i don't get to many problems with overly aggressive drakes. but it happens i separate that drake for awhile.