the site ncGreyBirdLady recommended is an excellent source.
you may also want to look into a condition called
hyperkeratosis that is another vitamin deficiency thing that is often found in canaries, appearing as raised picket scales n thick nails.... check out these pictures at:
Hyperkeratosis in captive starlings .
i've read that clover sprouts clears hyperkeratosis right up, btw.
as far as mites - and if you use a popular product called "scat", the label warns that it shouldn't be used on or around chicks ages 6 months or younger.
also-with air purifiers; isn't the ones that kill anything, does it by producing ozone?
i've read that ozone around birds was a no no.
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w/luv4allbeings