Darn, that was what I was afraid of. That isn’t a swim bladder issue, but rather, a neurological issue that this group of fish is susceptible to. Nobody knows the exact cause, but the symptoms are always swimming in circles, upside down, or with a bent tail fin. In some cases, the wrasse still tries to eat. Most people feel that it happens due to the wrasse hitting its head on something. I don’t agree as there never seems to be any external damage to the fish’s head. I think more likely it is viral, bacterial or possibly even nematode worms.
I’m really sorry, but I don’t have a treatment to offer. Many people end up euthanizing their fish.
Jay