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  1. Are these rocks safe to put in my tank?

    Beginner Freshwater Aquarium
    Well I found these quartz rocks out here in Oregon 1 year ago and I have had no use for them. I am wondering if it is safe to put these in my planned aquarium. I have read in many places that quartz is safe, but these seem so DIRTY! I'm nervous they'll slowly pollute the water. I have had them...