My ducklings have started refusing to eat their Brewer's Yeast. They're only 4 weeks old and are only eating the pellets in their dish. They're also refusing the last bit of crumbles i've been mixing in as i transition them to all grower ration. I tried leaving the dish in there in hopes they'd eat what was left but no luck they chose to go without instead. They pick every last pellet out and leave the rest. I got some electrolyte mix this morning that has 22.5 mg of niacin per gallon of water and another that has 25 mg of niacin per gallon of water. I'm currently putting 3 gallons of water in their coop each day. Is this remotely enough? Is it safe to be giving the electrolytes? I thought i'd read that giving the electrolytes would overdose them on other vitamins? I can't find any suitable niacin at the local drug stores-everything is time release or no flush versions. The only other thought i had was maybe i was mixing in too much brewer's yeast and they maybe don't like that much? I've been doing 2 tbsp per cup of feed. 2 tbsp was giving them 10 mg of niacin. So 3 cups of feed got 6 tbsp of brewer's yeast mixed in it.