Where I work there is a pretty large cement pound type thing with a fountain. The water has gotten kind of green. They are wondering about options to help this. Wondering if goldfish/ koi would do anything? I know there's some kind of filter screen for the fountain so I'm not worried about fish being sucked into it. The water seems to be kinda hard on the surface from the fountain when it's on but there is a 'cave' made of rocks they can hide in. The fountain is on a timer. I think it's 20 minutes on then 20 off. Just wondering if this is a possible koi pond or not. Can post pics of it tommorrow.
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