Hi just a question I have been losing my livebearers. All the water tests are fine. I am treating trying to figure out what it could be the main symptom is fast breathing, gills going very fast, They are healthy one minute then start breathing rapidly, lose their balance and die. This happens very fast and they die within 24 hours. This affects maybe one fish a week. I have treated for internal bacteria and parasites but am wondering what cpould be on their gills because they flick their gills. If it is not flukes or parasites could it be velvet would that get on their gills and cause them to die quickly. Shoul I try protozin? One of my guppies has just started showing signs of velvet on her back could this be the cause or could it be fungal so should I use myxazin. Please help I haveexpensive fish I don't want to lose.