Aquarium Decoration (Rocks, Plants and Substrates) • Any geologists in the house (marble scape?)

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Any geologists in the house (marble scape?)

Postby Kagia » Sun Nov 15, 2020 4:07 pm

I recently found a deposit of travertine/tufa, and upon closer inspection, found what I'm all but positive is a small deposit of marble metamorphic rock.

I've gone back a couple times to collect a bit for a new mbuna tank I'm setting up.

The rock has some greys and golden browns through it, which I've read may be caused by impurities in the limestone during metamorphosis.

Would this rock be safe for my fish, or could the impurities contain anything harmful to the fish?

Thanks.

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Re: Any geologists in the house (marble scape?)

Postby Deeda » Sun Nov 15, 2020 5:49 pm

Pics aren't working for me.
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Posting Pics Eff. June 20, 2017, Photobucket does not allow free pic hosting

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Re: Any geologists in the house (marble scape?)

Postby Kagia » Sun Nov 15, 2020 6:26 pm

Hmmm...It looks good on my end.

I'll try again.

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Re: Any geologists in the house (marble scape?)

Postby noddy » Sun Nov 15, 2020 8:17 pm

Looks like you struck gold : )
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Re: Any geologists in the house (marble scape?)

Postby Deeda » Mon Nov 16, 2020 11:39 am

I can see the pics now and the rocks look just fine to me.
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Re: Any geologists in the house (marble scape?)

Postby Kagia » Tue Nov 17, 2020 8:53 pm

Thanks.

I'm worried about the composition though. I read on one website that it may contain impurities like pyrite and iron oxide, which I'm guessing might not be good for the fish?
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Re: Any geologists in the house (marble scape?)

Postby rolf.miles » Fri Nov 27, 2020 3:43 am

Maybe it would be nice to find the geological composition for the places where your cichlid is from, so then finding similar rocks seems to me a pretty safe way to go.
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Re: Any geologists in the house (marble scape?)

Postby Auballagh » Tue Jan 12, 2021 7:03 pm

Those are good looking rocks!
As for the impurities you mention? I don't believe they will be much of a problem. If you place those rocks in a very soft water, acidic PH tank (Black water biotope), the water chemistry could react with and oxidize any metals in the rock. And, the lower the PH of your aquarium water, the more reaction you could possibly get between those rocks and the water (Geeeze... battery acid?!!!). But, even in a lower PH water aquarium environment, this is something which may - or may not - be much of an actual problem because of a couple things,
- Water changes to dilute Nitrate buildup, will also dilute any suspended metals oxidized from the rocks. The level of oxidized metal buildup may never reach levels that are a problem in the tank.
- Bio-slime, Diatom and Algae buildup. All of those things will coat those rocks in the aquarium, slowing down (not eliminating) the rate of potential metal oxidation from the rocks.
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Now, if you plan on using de-chloramined municipal/city water to fill your tanks with, like most of us do? You're already several steps ahead of any problems. Municipal/City water is purposely treated to increase the PH. That is, after the disaster of Flint, Michigan, no one wants to be responsible for providing acidic PH public water, that leaches the lead out of old service pipes and causes water toxicity problems!
So, if you plan on using those rocks to build and stack up in a high PH water Central American, African Lake Malawi or Lake Tanganyika biotope? Those rocks will definitely work out just fine in there. :)
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