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General Freshwater Discussion For all topics relating to freshwater fish to the in's and out's of maintaining a freshwater tank.

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Old 08-22-2018, 06:39 AM   #1
EdC
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Default Beach rocks

Has anyone used these tye of rocks (pictured)?

Any idea what they are called? I grew up calling them fossilized coral, but searching for that term on Google doesn't bring up anything similar.

I am assuming they would raise pH, but I am planning to put them in a Tanganyikan tank, so no worries there.
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Old 08-23-2018, 05:24 PM   #2
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Not sure which type of stone they are, but just in case, take a bit of white vinegar and lay them in it for a little bit. If they fiz or create bubbles at all, they are not safe for your tank. If nothing happens.. Give them a quick boil in water and then let them cool and they will be safe to add.
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Old 08-23-2018, 05:47 PM   #3
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Pretty sure they are inert. Like mentioned, do the vinegar test and be certain.
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Old 08-23-2018, 06:21 PM   #4
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I'm not sure the vingegar trick works. I purchased rocks from a local garden center and discovered that they were limestone. I poured vinegar on them and nothing happened. I soaked them for 48 hours and checked the water parameters, the GH, PH, KH didn't change. Limestone is supposed to be a no-no in aquariums but I've had no problem. I do a 30% water change once a week. Parameters are good.
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Old 08-24-2018, 07:52 AM   #5
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I posted the pic on a great lakes geology Facebook page. Consensus seens to be that they are stinkstones.
Basically limestone formed under anaerobic conditions. They smell when you break them due to a release of trapped petroleum. I would be totally fine with limestone, as I am planning a Tanganyikan tank, but I am less fine with the petroleum.
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