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Just scrape the fish with a sterile instrument and put it on a slide. Stain with crystal violet or your choice of dye, then counterstain to scope out visible bacteria and/or parasites, if microscope does not have oil immersion. You will be able to narrow it down to parasite or bacteria (gram - or +). From this you can then identify using spread plates if handy. I can give more details on how to create your own.
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