Pristine™ is very safe and quite difficult to overdose to the point of harming tank inhabitants - it would take a gross overdose to have any impact on tank inhabitant health. In general, the worst that can happen in the case of an overdose is a bacteria bloom which shows up as clouding in the tank. This type of clouding usually clears after a few days, or you can use Clarity® to clear the clouding out of the water immediately.
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