What kind of rocks two decorate sand substrate aquarium

My question is basically what the title implies I'm looking for types of rocks I can use to decorate an aquarium with a sand bottom so if anyone could tell me what kind of rock can go in an aquarium and not raise the pH I'd really appreciate the input thanks?

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For example would Wall and floor slate work?

 

Bumping this since I'm trying to find Slate and need to know About the possibility of using wall and floor slate.

 

Wall and floor slate tiles are fine. Just make sure it's natural slate, without the gloss coat. Also, make sure to give it a hot water bath to clean it before putting it in.

 

Slate is slate. You can get it from a hardware store and break it into smaller pieces to your liking, or you can use something else. My LFS' all sell small slabs of slate, so the large ones from menards and such are unnecessary. Fair warning, the edges are sharp enough to cause harm to fish like cory's who are not known for being the most wise. Especially if you break it and form even more jagged edges. You can pretty much use whatever rock you like, so long as its not limestone or doesn't secrete calcium. An easy way to test this is to take a rock you'd like to use and put a few drops of vinegar on it. If it bubbles/fizzes, it's no good.

 

Slate is slate. You can get it from a hardware store and break it into smaller pieces to your liking, or you can use something else. My LFS' all sell small slabs of slate, so the large ones from menards and such are unnecessary. Fair warning, the edges are sharp enough to cause harm to fish like cory's who are not known for being the most wise. Especially if you break it and form even more jagged edges. You can pretty much use whatever rock you like, so long as its not limestone or doesn't secrete calcium. An easy way to test this is to take a rock you'd like to use and put a few drops of vinegar on it. If it bubbles/fizzes, it's no good.

Thanks for the info on the Slate if I can get it from a hardware store I'll be careful how how I put it in my tank.

 

A nice thing about slate is its relatively soft when it comes to rocks. Jagged/sharp edges can be filed, or sanded smooth.

 

A nice thing about slate is its relatively soft when it comes to rocks. Jagged/sharp edges can be filed, or sanded smooth.

Thanks I found a good deal on a 12" x12" piece of unglossed natural floor slate I'm going to get Thursday, how hard is it to break into smaller pieces and what should I use to file it down?

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Put it in a pillow case, grab a hammer, and have fun.
Not to sure on the best way to smooth out the edges...maybe sandpaper?

 

Put it in a pillow case, grab a hammer, and have fun.
Not to sure on the best way to smooth out the edges...maybe sandpaper?

Great thanks for the advice.

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Low grit sandpaper 40-80 grit

 

Low grit sandpaper 40-80 grit

Thanks.

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