I have a 900 gallon pond with some goldfish, minnows, and a few koi in it. The water is crystal clear and I have a well established filter. A month or so ago the filter was clogged and I was out of town for a few days. By the time I got back the water was murky and the sides were covered in algae. Since then, the water has cleared, but the algae remains. The fish nibble on the algae, but are in no way going to eliminate it. I wanted to know if anyone knew of a pond creature (invert, fish, whatever!) that might eat the algae. I live in Zone 9. Last year I had a similar problem and tried a pleco. The pleco did a great job keeping the pond clean. It did okay over the winter, but died at the very end during one of the coldest weeks. By the way, the pleco did not latch on or bother the koi or goldfish. If anyone knows of any critters who may be of service to me, please let me know.