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Are these rocks aquarium safe?


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Want to do some aquascaping, remembered there are some pretty looking rocks in my backyard but im not sure if they would alter the water chemistry as I have 0 experience at identifying rocks of any kind. The rocks came from the sea side back when we went on a vacation four years ago, since then they have been in the backyard in the gravel with the plants. 4 years of raining, snowing, should be enough time to get rid of any salt from the sea, or stuff like that.. right? 

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