how many gph is recomended in a 20 gallon tank?

[first-timer89]

is 505 gph too much for a 20 gallon tank? how much do i need? please help!

 

[malkore]

minimum is 10 times per hour turnover, so 200gph for a 20gallon as a minimum.
I wouldn't say 505 is too much as long as your fish seem happy and the sand isn't blowing around like crazy.

 

[first-timer89]

thanks