Re: Problem dosing vitamins
Investigate oxidation, external dates and consideration of exposure to dampness or temperatures.
Dampness, repetitive and frequent, can be a simple factor of task sequence, so go over how they are handled, note fingers. Do they contact water beforhand? Oh, and follow your nose. A sharp metallic odor is not ideal.
I have noticed anurans and other small herps spit out and then learn to refuse feeders with stale supplement, and then resume more familiar eagerness with lightly supplemented fresh supplement.
The Key Word Is Lightly.
I dont know if this is what is happening in your case but Ive known it to happen, and fielded countless, about animals refusing coated feeders.
Some advice will say only "Keep Feeding" but a complete address of the presented reluctance must include the quality/oxidation character of the supplement, with some animals.
Ive known frogs with quite the food item memory.