Types of hardscape rock - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 06-19-2006, 07:16 PM Thread Starter
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Types of hardscape rock

Are there any "no no's" with regard to rock material one can use in a planted tank? I don't want to change my water chemistry too drastically but I want to add some rock for my fissiden and xmas moss to grow on and to add some depth. Can any of you suggest type of rock to use that will achieve this?
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post #2 of 9 (permalink) Old 06-19-2006, 07:43 PM
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dont use bedrock ( former live rock, it will raise your pH ), limestone is bad one too and i think sandstone will toy with the water some too...i may be wrong about that one though

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post #3 of 9 (permalink) Old 06-19-2006, 10:52 PM
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Lace rock will play with your water chemistry (along will most calcium rocks)
Rocks with veins of metal in them are unsuitable.

Some common rocks that will work.
Lava rock, Slate rock, Quartz, Blood stone, Pogoda stones, Granite, River stones.......the list goes on and on.

IME the key to finding a rock that will work is testing it with Muriatic acid.


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post #4 of 9 (permalink) Old 06-19-2006, 11:11 PM
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Quote:
Originally Posted by TheOtherGeoff
dont use bedrock ( former live rock, it will raise your pH ), limestone is bad one too and i think sandstone will toy with the water some too...i may be wrong about that one though
True sandstone should be inert. Made up of mostly quartz and feldspar grains.

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post #5 of 9 (permalink) Old 06-20-2006, 12:07 AM
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Many times sandstone contains carbonates as the bonding material.

Easy way to test. Use acid. Strong acid. Vinegar won't work. More info in my Guide.
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post #6 of 9 (permalink) Old 06-20-2006, 12:11 AM
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Hahahaha...sorry, I guess I should not reply as a geologist, but as a hobbyist. To a geologist, if the carbonate content were sufficient to alter water chemistry, it would no longer be a sandstone.

Actually, many rocks will have post lithification carbonates in it or concurrent carbonates...shales, slate, even granites have some carbonate...but just not enough to alter the water chemistry and often times, not exposed enough to be able to leach into the the water (interstitial carbonate, as sometimes happens in retrograde metamorphism)....but I digress.

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post #7 of 9 (permalink) Old 06-20-2006, 03:36 PM Thread Starter
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Thanks guys....a lot of useful info. I guess the best way the old muratic acid test. With all of the stuff I have been ordering lately, I am sure I am on some kind of watch list!
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post #8 of 9 (permalink) Old 06-20-2006, 03:55 PM
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With Muriatic (Hydrochloric acid) depending on strength, you'll get fizz with even some "safe" carbonates like siderite (iron carbonate) and such which have low solubility in water, so as long as the rock and the acid are cool and you get minimal fizz, you're golden. Your only concern is if you get lots of fizz at room temperature.

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post #9 of 9 (permalink) Old 06-20-2006, 07:50 PM Thread Starter
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thx wheels!
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