If cork released anything into the water, they wouldn't use it to bottle expensive bottles of wine. Cork releases nothing. Get a piece of natural wood and float it in the tank for a day. It may turn the water brown, but those are tannins that will acidify the water. Do not use eucalyptus branches. If you want clear water, use some "PH decreaser" sold at tropical fish and pet stores. Be very careful with this though, because too much acid (which is all this stuff is), can burn your turtles eyes and skin. Read directions carefully. Also buy a PH kit to test your water. Buy one that uses drops and not pellets or sticks. Its cheaper, quicker, and more reliable.

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