Brutuscz
You mention that YOU had no storage issues. What has been posted on this thread concerns what the dealers do, not you or I. When a dealer gets his shipment, it is usually in large quantity. If they know what they're doing (which some don't) they must mix/re-mix it very thoroughly to make sure all ingredients are balanced within the mix BEFORE they re-bottle it in smaller quantities to sell at retail. There was a thread a few months ago that became a very heated discussion concerning the efficacy of Supraverm vs Prazi Pond. This subject was discussed there also. There seems to be only a few known sources that REALLY care about making sure the dosages, when re-bottled, aren't dilute or over dosed. Sounds like you may have gotten a bottle that was from the bottom of the shipped container that hadn't been re-mixed properly and ended up overdosing your fish without you even knowing it! That's the problem with Supraverm. I tried it once and will NEVER use it again. The effectiveness and safeness of PraziPond is just what I was looking for and have had success the last 3 years in a row in seriously REDUCING the fluke population in my ponds in spring and fall. I use it twice a year, during the above mentioned seasons when the fish are their most vulnerable.
Now, after having said all that, even though I haven't seen your fish and only have read what you have posted about your problem(s), do you think it could have stemmed from a very infectious bacterial infection. Last year and this year again, people are getting SERIOUSLY hit by a bacterial gill infection. I've seen it happen in very clean systems and dirty ones too. All of a sudden, a single fish or a small few, start showing symptoms by isolating themselves, most near the surface, especially near oxygenation sources (waterfalls, airstones, etc). Within a couple of days they're gone. Upon inspection, the gills are totally necrotic on one side or both. Skin feels like sandpaper, some white crusting of the mucus(slimecoat) shows on some but not others. Others will die and show no outward signs of gill problems, but upon autopsy their liver and kidney have become granulated. NO, I KNOW WHAT YOU'RE ALL THINKING-THAT'S KHV!!! NO IT'S NOT, IT'S A BACTERIAL INFECTION. I know because I lost 12 fish to it last June. The amazing thing was that with a single injection of Amacacyn I was able to turn 5 more fish around within 2 days. They were back to eating and acting normal. The crusting of the slime coat disappeared and the skin rejuvenated it's slime coat back to normal within a week. I know of 4 more cases of this kind of outbreak this year again. One is currently ongoing in a friends pond. He has lost 3 fish in the last 3 days. They were all his BIGGEST and of course the best of his collection. No new fish purchased within the last 3 months and those were quarantined for 4 weeks first. What the hell causes this??