Size of powerhead

Maeglin

New Member
Jan 8, 2016
4
0
1
Australia
I'd like to use a powerhead to increase the current passing over the bottom of my 20 gallon long tank.

Long story short, went into the lfs and they recommended a tiny powerhead which I purchased, but I can't even feel the flow a quarter of the way tank. I want a good flow that will cover the whole 60cm.

So I have come to the experts Lol.
How many gallons per hour should a powerhead pump for my tank? Any recommendations? Thanks in advance!