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NO! Hydrogen peroxide will poison your fish. If you go to a pet store they willl have the proper water treatment for your tank. This neutralises all the things in tapwater that are harmful to fish (such as chloramine, ammonia and heavy metals - it's not just chlorine that is bad for them). If you know exactly what is in your local water supply and have a very good understanding of water chemistry, you can use pure crystals of sodium thiosulfate to dechlorinate the water. This is the chemical mixed in most commercial water treatments to remove the chlorine.

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15y ago
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Q: Can you dechlorinate your aquarium with hydrogen peroxide?
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