small gravel (aquarium size or a little bigger)

need a couple of pounds of small gravel for a high school science
activity - aquarium gravel would work, or something a little bigger
would be ok too. I can make multiple pickups from different people to
get to the total weight needed. Figured I would ask before going to buy
some. Thanks for freecycling and have a good weekend!
Can you help with this request?
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