My name is ***** ***** I have been a Vet tech for 30+ years and a fish keeper over 40+ years.
Can you tell me what symptoms she is showing?
Is the QT tank newly set up?
What is size of Tank?
Have you checked water quality?
What is the Ammonia, Nitrites, Nitrates and Ph?
What type of test kit are you using?
What type of medications are you loosing?
Any blood in the fins or around the Gils?