What can I paint my concrete, outdoor floor with?

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I have a screened/walled in patio with a Koi pond. The floor gets moldy which is not only unattractive but unhealthy! I would like to paint a design, such as a rug, which would not be toxic to the fish when it rains but also help with the mold which you can see towards the front of the photo! Thanks so much for all of your wonderful advice!

q what can i paint my concrete outdoor floor with
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