Sorry to hear of the continued troubles. Sounds like your fish did have multiple issues as I wondered (ich and flukes). That makes things
very difficult to resolve.
Here is a thread where one person used Fix Ich in an early case of ich. If you read the first few messages, and then scroll to March 2021, you see the OP says it suppressed, but didn't cure his issue.
My LFS has been dosing FixICK lately and he stated that he has seen pretty impressive results. I just bought a powder blue and powder brown that had outward signs of ich two days prior to the fixick treatment and I have had them in my QT for 3 days and haven't seen anything. I am going to dose...
www.reef2reef.com
Jay