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Interesting concept. It will make a fine pond without fish.
If you want to have fish in there, it will need an outdoor aquarium filter for the nitrogen cycle. The filter system must be on 24/7 in order to keep the nitrogen cycle going. So the solar power alone isn't going to be enough unless you have batteries to store the solar power for night time use.
The selection of outdoor fish are usually limited. Unless you live in a tropical area with a fairly large pond, you can only have koi or goldfish and a few other species. They are quite big, so the pond can't be too small either.
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