I just lost a piraya and a super 2 days in a row. They had pretty much the same symptoms, fin rot hazy eyes, swimming at an upward angle and near the top of the tank. I havent changed my water since i got them which was about a month ago, but my 2 caribe are all good. Do you guys think the deaths were due to polluted water? Oh yeah my tank is 150 gal, 2 magnum 350 filters, air pump for a 60gal tank, yet to get a powerhead.