09-28-2008, 01:48 PM
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Thank you all ever so much for the answer!
I was just in two minds. Knowing that one of my tank was established a very long time ago, and noticing that cories do not do very well there, I thought that could be the gravel's fault. The tank is cleaned with a sifon regularly. Other fishes and snails are fine. The cories must have a diferrent issue.
I have also heard that some people do a complete rinse and even change, but they are not knowledgeable in this hobby. So I decided to ask.