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Old 03-11-2012, 08:50 PM   #1 
Heavenly Jumper
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Question Making a found stone safe

I found a gorgeous chunk of pink and black granite at my family's barn today. I'd love to be able to use it in my tank. Does anyone know how I can sanitize it? I was thinking of boiling it, would that be sufficient to kill any bacteria or other organisms?
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Old 03-11-2012, 09:27 PM   #2 
Bombalurina
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I wouldn't boil it, as that could cause it to explode. Not safe.

I would do multiple washes in bleach, then test it in an empty tank for a month to see if it affects pH, hardness, alkilinity etc.
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Old 03-11-2012, 10:08 PM   #3 
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i have tons of granite rocks that i picked up and put in my tanks. what i did was scrub them with detergent and a scrub brush, wash them a LOT, then i boiled them in salt water a few times for quite a while.

I dont think granite would explode if you boil it.
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Old 03-11-2012, 10:43 PM   #4 
Aus
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I collect rocks. Because I'm a huge geek.

And that granite sounds really pretty - and being granite is very likely safe as well.

I just had to say, as a general thing - be careful to accurately ID the mineral content of any rocks you find and might want to put in your tank. Some contain minerals that could poison your fish - like the copper in malachite, for example. Calcium-bearing rocks can seriously mess with water chemistry. Other minerals can slowly dissolve in tank water, releasing arsenic, lead or other deadly elements into your tank, especially if your PH is low.

All rocks with 'glitter' or seams of metal in them should be avoided. Many stones sold at new age type shops as decorative or 'healing crystals' aren't great for fish - amethyst has manganese in it, pyrite is quite toxic, etc. Clear quartz is pretty much always going to be okay.

Here's an article on toxic minerals:
http://www.cichlid-forum.com/articles/rock_metals.php

And a forum post written by a geologist, which is pretty awesome:
http://forums.livefish.com.au/viewtopic.php?f=1&t=5547

And here's a really comprehensive list of the toxins found in many minerals - the site linked is concerned with the making of gem essences for human & animal consumption, but much of it would apply to aquariums as well.

http://webzoom.freewebs.com/crystalh...20Stones-2.pdf

Last edited by Aus; 03-11-2012 at 11:00 PM.
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Old 03-12-2012, 04:49 AM   #5 
Hallyx
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Terrific advice and links, Aus. Thanks a lot.
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Old 03-12-2012, 04:44 PM   #6 
Bombalurina
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Maybe you should make a rock sticky, Aus.
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Old 03-18-2012, 03:10 PM   #7 
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That's a great idea, Bomba. :)
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