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Hi, I want to setup a 20 gallon low-tech tank. As far as filters go, would any of you advise to use Marineland penguin filters, the ones with the bio ball? Are there any better options as far as hangon back filters? I'd appreciate some suggestions. thanks. :icon_cool

I would do as Walstad, just use a internal powerhead / sponge filter. I think spong filters are underestimated. There are many advantages with internal filters: Easy to hide when hidden behind plants, no technic sticking out of the tank. No risk for water leaks from filter. Very easy to clean and handle.

So if your tank not is very small, i would go for an internal filter.

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