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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.