Fishkeeper
Crowing
Diatomaceous earth doesn't help with much of anything. It's seriously dangerous to the lungs of all involved animals, including you, especially your birds, if it gets into the air. Large enough amounts to potentially harm invertebrates will risk getting it into the air and harming your birds. A bird with a mite infection should be given proper mite medications, not DE. It definitely won't help a fungal infection- it's just tiny bits of sharp dirt that scratch the exoskeletons of invertebrates. Fungi are not invertebrates.