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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.