We have a 20 gallon tank with 2-4 inch goldfish and 2 small cleaner fish (4 fish total). We spent two years with a greenish tank that we couldn't easily get clean. This amazing product was recommended at the local pet store. If only I knew, I just need more coal to filter the garbage. I use this product instead of the recommended activated carbon filters. I change monthly and also vacuum the stones and change the water at the same time. Finally a clean tank!
Powerful And Quiet Submersible Pump For Aquarium, Pond, And Hydroponics: KEDSUM 660GPH Pump With 6Ft High Lift And 3 Nozzles
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