You might need to be mixing more water into the food to start with--it shouldn't be drying up in two days time at 50% humidity unless its just a really thin/shallow amount of it that you are starting with. In that case, I would make it a bit deeper. If it does dry up you should replace it with new food, so that the mix is correct. Some cresteds also seem to prefer the mix to be a day or so old, so make sure you mix it wet enough that it is still edible after 24 hours without you having to add more water.
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