You may want to rethink the pond idea...
One of our society members has a pond to keep the humidity up... but he is plagued with literally hundreds (he says thousands) of frogs. They are pooping everywhere and causing all kinds of problems. Breaking spikes and such.
You may consider a "dry pond" where you have water fall into a pit filled with rocks. Put a pump at the lowest end and cage it off so you can service it when needed.
You get your humidity rise, pleasing sound and no mosquitoes or frogs...
Just my 2 cents.
AHAB
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