What kind of rocks are these and are they safe for fish tank?

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Otto1995

Aquarium Advice Newbie
Joined
Jul 25, 2017
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1
Idk what kind of rocks they are does anyone know?
 

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Check out this article, it has information about all aspects of setting up natural decor. Down the list and then further down is infor for types of stones and how to test them.

One thing is where they came from.

Some rocks around yards and buildings are often sprayed with insect poisons, plant killers and other stuff. So it is good to know where they came from if you collected them for your tank and might need some good scrubbing with water and baking soda and vinegar.
 
The one on the left reminds me of some limestone, a conglomerate was also thought of.

No idea on the green one.
 
The 3 pinkish colored rocks look like quartzite. The big flat piece and possibly the little flat peice next to it look like slate. As for the green one, your guess is as good as mine. Quartz and most slates are usually aquarium safe.
Hope this helps.
 
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