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Old 02-07-2013, 12:45 PM   #1
Low_t Tom
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Safe Rocks

What type of rocks can I safely use to aquascape? Can I just go buy slate at home depot and crack it up? What about rocks at local landscaping/home improvement stores?
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Old 02-07-2013, 02:45 PM   #2
steven p
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Slate works, I think I have shale in tanks too...

Random rocks: soak in buckets for extended periods of time... Watch for shifts in params. Or pour some vinegar on it and see if it reacts.
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Old 02-07-2013, 09:39 PM   #3
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Very rough rule of thumb (with lots of exceptions):

Igneous rocks are almost always safe

Metamorphic rocks are usually safe

Sedimentary rocks are best avoided.

The acid test is frequently used, but isn't that reliable, especially if you are only using vinegar.

Be wary of anything with metallic colors/flakes/bits

that said, rockyards, garden centers, landscaping supply places can be great places - you'll get stuff much cheaper then at an aquarium store.
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