Concrete safe? - The Planted Tank Forum

 
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post #1 of 10 (permalink) Old 04-20-2013, 10:21 PM Thread Starter
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Concrete safe?

I was at a local greenhouse and they have Seiryu Stone pieces that are built together with concrete on the bottom. Cheap...8.00 ! Is concrete aquarium safe?
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post #2 of 10 (permalink) Old 04-20-2013, 10:23 PM
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Yes, I use concrete to cover DIY 3D backgrounds.
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post #3 of 10 (permalink) Old 04-20-2013, 10:24 PM Thread Starter
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Great, Thanks!

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10 gal community tank
5.2 Mr. Aqua - Blue Velvet/pygmy cory tank
6 gal Fluval Edge - PFR/cory haustas tank
2 gal Betta Jar
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post #4 of 10 (permalink) Old 04-21-2013, 04:58 AM
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Generally yes, with a few caveats. It needs to be completely cured. Depending on the makeup,of the concrete/cement, it may change your water chemistry, similar to limestone type rocks. But is it safe, yes, fish and plants will do just fine
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post #5 of 10 (permalink) Old 04-21-2013, 05:15 AM
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There's some SW guys that make a lot of their rock from concrete. Like stated, it needs to be cured or it will not work. I'd soak it a few days and do before and after water checks to see if it changes anything.

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post #6 of 10 (permalink) Old 04-21-2013, 01:54 PM
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I know exhibit fabrication guys who use it all the time. They do soak/rinse with acetic acid though to shorten the time it will leach and affect tank pH.
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post #7 of 10 (permalink) Old 04-21-2013, 03:03 PM
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yes concrete is safe, but it will pull your ph up pretty high if your not careful. It's ssimilar to adding volcanic rock for a ph buffer. Just fyi.
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post #8 of 10 (permalink) Old 04-21-2013, 03:08 PM
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Concrete safe?

Beautiful arrangement. I like it.
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post #9 of 10 (permalink) Old 04-22-2013, 07:04 PM Thread Starter
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Great, I will soak it for a while before putting it in my tank. My local green house had a whole bunch of these with their Bonsai displays.

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5.2 Mr. Aqua - Blue Velvet/pygmy cory tank
6 gal Fluval Edge - PFR/cory haustas tank
2 gal Betta Jar
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post #10 of 10 (permalink) Old 04-25-2013, 12:51 AM
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I've ran across descriptions of using concrete for building large aquariums and ponds and such.

Usually they wait till it's fully cured, soak it in water, and also soak it in some sort of acid (vinegar, dilute muriatic, etc.), and then do another water soak.

I wouldn't consider untreated concrete safe at all, it's a pretty alkaline substance. A lot also depends on what the source of their aggregates and additives and such are.
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