04-10-2011, 02:53 PM
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adding more than the recommended dose is "overdosing" whether or not it will hurt your fish is different. It is always best to keep the water as chemical free as possible so adding more than necessary, even if harmless, is just a waste. In terms of water conditioners that do more than dechlorinate, such as the ones that neutralize heavy metals, they will affect available metals in the water for plants and such.