Pump Option for my 55 GA Tank

[PUR_salt_vettech]

Hello, is it true that as good rule of thumb, a pump should be one that can move water gallons per hour (GPH) 10 times (10X - 50X) the number of Gallons??

Which Pump is a good one, Im opting for External one!!

Please mentioned your top 3!!!

 

[Heliarc19]

I like the varios2 or 4, depending on what all you will run with it