At Smith College greenhouses, they had to stop having fish in the ponds because people threw coins in and the coins poison the fish. The stone picture sculptures were really cool! And I loved the geese landing in the pool.
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Interesting maybe copper and nickel ruins the ph balance of the water. I seem to remember a few coins in the koi pond before they shut it down. Maybe they have to drain it every so often and clear out all the coins and wash out all the bad algae before putting the fish back in.