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I found some rounded stones in my neighbor's flower bed/garden
and was wondering it is safe to put in the aquarium?
They look very similar to these...
I don't know what the stones are, but I have boiled them (30 mins) and tried the vinegar test.
Anything else I should do to determine they aren't going to kill my fish?
Thanks.
They look very similar to these...

I don't know what the stones are, but I have boiled them (30 mins) and tried the vinegar test.
Anything else I should do to determine they aren't going to kill my fish?
Thanks.