I think you got all the advice you can get including first hand experience treating and healing this condition. My advice would be clean water clean water and clean water.
Good luck
×Go S Vettel #1 Infiniti Redbull! 3x WDC!!!×
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Cheap way to decrease nitrates and keep your fish healthy:
http://monsterfishkeepers.com/forums/showthread.php?t=504763