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Old 08-04-2010, 12:50 PM   #11
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I was thinking playsand was closer to 10 and aragonite was 15... But my prices are fairly outdated. haven't got sand in awhile.
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Old 08-04-2010, 12:52 PM   #12
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The other, more important issue IMO, is the shape/texture of the sand. Silica playsand is basically crushed quartz. It has lots of tiny sharp pieces. Aragonite sand is ground up corals. The sand is smooth from being worn down by water. The shape of the sand may or may not affect sand sifting creatures.
Silica playsand will work and many people use it. You just have to decide if the money saved over buying aragonite sand is worth any potential problems down the road.
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Old 08-04-2010, 03:54 PM   #13
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Id go with aragonite too. Its expensive, but looks much nicer than silica sand. I paid $20 in town for a 15lb bag made by CaribSea.

Plus, doesnt aragonite help to buffer the pH and alkalinity? Seems control over those two things is worth the difference. Im not sure how well they buffer, but anything to avoid having to dose seems ideal.

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Old 08-04-2010, 08:37 PM   #14
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The only way aragonite will dissolve and start to buffer the water is if the pH drops below 7.4. That should never happen in a reef tank. It will buffer the water in freshwater setups as most are well below 7.4 pH.
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