Looks like most live animals are now not allowed.
www.coralmagazine.com
Back in the day eBay was a pretty large marketplace before all the small coral websites showed up. I remember selling a dinner plate sized chalice on there.

eBay Bans Nearly All Live Animal Sales on Platform - CORAL Magazine
Fish and coral sales on eBay appear to continue "business as usual" at the moment, but a policy change due to take effect in mid-March would effectively shutter one of the largest online marketplaces for small businesses that sell aquarium livestock.
Back in the day eBay was a pretty large marketplace before all the small coral websites showed up. I remember selling a dinner plate sized chalice on there.