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Rock info needed

Taylorg

Seedling
Joined
2 Jul 2021
Messages
11
Location
Thailand
Could anyone please help me identify these two rocks? And are they aquarium safe or how to check?
 

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A few drops of citric acid will let you know f they contain CaCO3, if they bubble they have CaCO3 and will increase the Hardness of the water. If no bubbles then the rock is inert and the hardness will be unaffected.
 
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