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Discussion Starter · #1 ·
Generally speaking, how much flow should I be looking for in a powerhead for a 20 gallon tank? Seems like the Koralia 240 is a popular powerhead, but do I really need a pump that turns over 12x the volume of my water in an hour?
 

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I have a Maxi-jet operating in power head mode that is 160 gph. That is 8x my 20 gallon and I think its alot but my fish tolerate it well. I removed it on Sunday after a little maintenance and it took all day for the tank to ALMOST clear. I wanted to leave it off but I need that flow to be happy. I wanted a Maxijet 400 but they were out of stock.
 

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Discussion Starter · #3 ·
I have a decent flow at the top of the tank from my HOB, but I'd like some more circulation at the bottom. I'm think an 80 gph water pump should be good, or should I try for a little more flow? It sound like 160 gph might be too much.
 
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