I've been feeding Hikari, PE, Ocean Nutrition etc. Some of the food I feed is frozen, some freeze dried, some flake...fish die sometimes, it's similar to a new study out now that says antioxidants may actually cause people to die sooner. Whether a fish gets sick or not and dies or not could have as much to do with stress and genetics as it does for us. Not trying to dismiss your concerns, just speaking my two cents worth.
Doug
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