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Nitrite should be tested weekly in new aquarium set ups or whenever the fish are showing health problems Nitrite is produced from the breakdown of ammonia in the filter. Nitrite is highly toxic to fish, but is usually removed from the water by the bacteria which live inside the filter. However, in new tanks, or if the filter bacteria are damaged, the nitrite level may become toxic.
On 18-Aug-07 at 12:20:16 BST, seller added the following information:
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Postage and packaging Item location: PAIGNTON, Devon, United Kingdom Dispatches to: United Kingdom
 
*The estimated delivery time is based on the seller's dispatch time, the postal service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
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