How to clean gravel or substrate from outside to use in a tank?

    What are your methods for cleaning items that you find outside? Such as like river rocks, or even driftwood pieces?

    Are these even safe, do you even clean them minus a rinse in water with a sponge?

    I normally just rinse it thoroughly with water, and then test the water with a bigger spectrum of parameters to see if it is releasing anything toxic (or has something toxic coating it). If so, I just try to rinse with vinegar and if it that doesn’t do anything - I just discard it.

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