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Title: It's an undergravel filter... does it's job
Review: I really like undergravel filters for filtration. It's old school tech and if you go with some plants, it will fertilize them. I've had systems setup where I didn't have to change water for 6 months because of the balance between plants and the filter. Just topping off. Just beware of some of the colored gravel. I bought some from petco that broke down in 2 months and mass killed all the fish in my tank. I've got the filter in another tank with different gravel and it's working fine.
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