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View Full Version : Geologists - These Rocks Safe?



DogWalker
11-19-2006, 09:24 PM
These are samples of rocks that were dug up in my yard during the course of a renovation project. Hoping to put them in an african cichlid tank, so I'm not worried about the effect on hardness/PH. I am more concerned about whether they might contain unacceptable levels of heavy metals and such. I tried the vinegar test and none of them fizz, but I'm not sure if that is a useful test for heavy metals. One or two of the rocks have tiny gold speckles, which I seem to recall could be bad news in an aquarium if they are what is known as "fool's gold".

DogWalker
11-19-2006, 09:26 PM
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DogWalker
11-19-2006, 09:27 PM
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DogWalker
11-19-2006, 09:28 PM
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DogWalker
11-19-2006, 09:28 PM
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DogWalker
11-19-2006, 09:31 PM
PS: I should mention that I scrubbed and soaked them in a solution of warm water and muriatic acid (about 1 part acid to 20-30 parts water), then rinsed them in cold water.

Glaive
11-19-2006, 10:38 PM
I would be more concerned with pesticides and poisons than a rock leeching heavy metals. I might put them in a bucket with a bubbler and add a couple canaries(feeder fish). But that is as crazy as I would go.

I am guessing since the vinegar test "failed" then they are rather inert. If you had had a fizz then the rocks would have been carbonic. The vinegar test and its results are a bit the myth in the sense of not adding them to a tank, just comes down to your preferred water chemistry.

DogWalker
11-24-2006, 11:27 PM
Ok, I think I am liking the look of 'backyard rocks'. Think I'll round up some more. Thanks for the reassurance.

DogWalker
11-24-2006, 11:28 PM
Seems as though previewing a reply before posting deletes the imbedded picture??