I built my own small pond with a waterfall upstate N.Y., had fish in it for two years. The only issue I had was I found a dead possum in it one day. Must have gotten in and couldn't get out.
I now have a nice size fountain in my birdcage which I purchase at a nursery. I've had it for 11 years, it run constantly, and I've only replaced the pump once which was no big deal.
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