05-20-2011, 01:29 PM
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Originally Posted by Byron
I already answered this question in your other thread, but since no one seems to be jumping in here, I'll repeat as it may start some discussion.
Flourish Comprehensive contains trace minerals that are what is known as heavy metals (iron, copper, zinc, manganese) but in such low amounts that they will cause no harm to any fish, invertebrate, or aquatic creature in the aquarium provided it is not overdosed.
The level of trace metals in many water supplies is far more threatening to fish than what is in Flourish.