Hi @amm59063,
What marker gene are you using? COI? If so, you can check out these CO1 data resources.
If you search the forum, you’ll find several threads related to the generation of custom classifiers.
Lastly, keep an 
out for updates to our recently announced external plugin: RESCRIPt. We hope to add more support for acquiring, formatting, and curating, reference sequence-taxonomy databases.
-Best wishes!
-Mike