So this filter does its job. I got one for my 20 gallons. Works well, cheap and easy to clean. But I don't recommend for 20 gallons. After all, you need to clean the filter every other day for it to work effectively. I ended up buying a more powerful Aqueon filter but I'll keep this one just in case. This filter also has only one sponge. I personally prefer 3 filter systems.
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