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testing rocks?



How can I test whether a rock will be toxic in the aquarium?  Will the
water become harder?  Measured Ph and hardness of water and then placed
rock in the water and will test in a week.  Ph is 6.4 and 2 degrees of
hardness.  Not bad for out of the tap if you keep dwarf cichlids!

The rock is said to be granite and has fleck of a metallic flecks.  I
have read that some rocks with these flecks will give off toxic
substances.  Any ideas?

Thanks for any assistance.