First off you should stop with the MELIFIX, Pemifix, stress coat.they are ALL INEFFECTIVE MEDICATIONS.
You should visit aquariumscience.org
it's a great site with an extensive and comprehensive library of fish diseases and treatments.
the author's name is Dave.
and he can be reached at dlboge2@gmail.com
This man is extremely knowledgeable about diseases and treatments
you can email him pictures of your fish and get some very good advice.
I wish you luck,
Kenneth