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Old 05-10-2004, 12:33 AM   #1
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Rock question?

I asked this question on another thread last month and did not get any answers.

I have some rock that I found. It is flagstone. I have pressure washed it and it is setting in the garage. I wanted to use it to build a base wall in my tank, but I am not sure if it is OK to use it or not. Can anyone help here? I would appreciate any help on this.

Mike
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Old 05-10-2004, 12:37 AM   #2
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Not sure if this is a definative answer or not but put it in water and see if it leaches PH or not. I know the agrocrete stuff I made caused lethal levels of PH for months. Never really saw it lower ... gave up.

HTH
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Old 05-10-2004, 12:54 AM   #3
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What is the composition of flagstone? Aside from the possibility of contaminants that may have soaked into the rock, that would be a deciding factor.
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Old 05-10-2004, 01:00 AM   #4
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Thanks for the quick reply. I think it's main compostion is limestone, not sure though. I will see what I can find out. Again thanks for the replys.

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Old 05-10-2004, 01:15 AM   #5
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OK this is what I found on the internet concerning flagstone. I also got a picture of it that I will post also.

"Tan to Brown in color with moss. Rough sandstone that varies
in thickness. Commonly called "Waterfall" rock. Easy moss
growing flagstone.
Colors ranging from light to medium tan with swirls of
pink and rusty hues on most of the stone. Moderately
hard smooth sandstone."
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Old 05-10-2004, 01:19 AM   #6
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try it again
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Old 05-10-2004, 01:52 AM   #7
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I don't think limestone is a very good choice for aquariums, as I am fairly sure it will leech into your water and make it very hard. Try putting some vinegar on it and see if it fizzes. Fizz means that it is a poor choice for your aquarium.
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Old 05-10-2004, 09:17 AM   #8
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Quote:
Fizz means that it is a poor choice for your aquarium.

But the sand we are all trying to fins fizzes.
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Old 05-10-2004, 09:47 AM   #9
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Yes please remember this is a SW tank, LR is mostly limestone, however, sandstone and limestone are not the same (are they?). I would be concerned about the mineral content of sandstone. Personally, I suspect this rock will have a high metal content in it, and possibly some food for nusciance algae.
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Old 05-10-2004, 09:53 AM   #10
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I suspect this rock will have a high metal content in it, and possibly some food for nusciance algae.
I agree. I am using "flag stone" (I call it slate) in one of my tanks as a temp "cave" and I have a green hair agae bloom that is wild. However my snails are tearing it up.
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