05-16-2009, 03:03 AM
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I would do same. Remove the rocks and pour a little vinegar over them. If they begin to bubble or fizz ,,I would not use them. The sea shells ,could cause water to become more alkaline over time ,and this could, (would) cause pH to rise. Depending on the fish you plan on keeping.. this might not be wanted. You can run a bucket of water from tap assuming you are using tapwater,,and test the pH after the bucket has set for 12 hours. Then place the rocks and shells in that bucket and after another 12 hours test the Ph once more. If there is a significant difference,, I would not use either.