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[–] Plavonica ago 

50gph filter is fine. Just don't use a 50gph pump to go with it. If you get a pump, try to get a variable one. Even if it isn't variable you can buy a sliding potentiometer to control its power input, and therefore its pumping speed. I have no idea what gph you would need for a pump on a 20gal tank, but it's probably some fraction of 20.

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[–] heygeorge ago 

I suppose that depends how quickly you want to change over the water, if that’s the rating for the entire pump assembly and not just the filter itself.

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[–] Inaminit ago  (edited ago)

[–] [deleted] ago 

[Deleted]

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[–] thelma 0 points 1 point (+1|-0) ago 

Are you planning on putting fish in that hurricane machine ?

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[–] Countryboyseein 0 points 5 points (+5|-0) ago 

I've kept fish for years. Having more filtration than needed won't hurt a thing. Although it will set up a current in your tank that some species might not care for.

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[–] Morbo 0 points 6 points (+6|-0) ago 

Just add 30 gallons of fish to your aquarium and everything will be fine.

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[–] HotFarts69 [S] 1 point -1 points (+0|-1) ago 

This is about what I expected from you assholes. God bless.