i just put a nano koralia in my 5.5
it flows 240 gph and is only 2.5x 2.5 so it doesen't take up a ton of space
the flow pattern is better than any direct flow PH out there, and after seeing how rediculous this little pump is for the 30.00 price
The Koralia's or the Tunze are all i would ever use for a powerhead again, direct flow is a no go :]]
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