It's overkill to use dust or spray and Ivermectin on the birds. Ivermectin is effective for lice/mites. Since you've administered the Ivermectin, repeat in 14 days.
For housing, use your dust or spray. You can try putting the dust in the sand to see if that helps, but also don't forget surfaces like roosting bars/nesting boxes, etc.
For housing, use your dust or spray. You can try putting the dust in the sand to see if that helps, but also don't forget surfaces like roosting bars/nesting boxes, etc.