Safe Concrete

Concrete is safe for fish?

I found a rock that would be good to add to the cave I made ​​in my aquarium, but it has some practical about this ...

Add "From" things are always scary. I think concrete years it should not to leech too much wrong with the exception of lime which can increase the pH and water hardness. I want to clean the rock by chipping concrete and soak in a bleach solution for a few days. The biggest problem is what kind of rock is it? Is it safe for fish? Many rocks Natural dissolve quickly in water. Some have natural arsenic or even radioactive properties. My rule of thumb is that if you can not be scratched with a screwdriver or similar, it is probably safe. Harder is better.

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