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Discussion Starter · #1 ·
I was thinking of using shell sand (you know the ones that are on beaches) for the tank i'm setting up
i'm gonna have 12 red belly's (small) in it ....

Can i use shell sand with out any mayor proplems ??
 

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More than likely you are talking about a substrate made up of calcium carbonate. If so, that will buffer your ph up to the 8.0 range. Thus, not a good substrate for piranhas. It would be better to go with either a gravel.
 

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that sand may contain co2.....that sand maybe limestone....If I where you I would take a sample and see if it fizzes......If it does that mean the the rock is indeed limestone and have calsite.....calsite(calcium carbonate) is a mineral that is created by co2 from fish and rain/water.....that can bring your PH high BTW
 
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