Power head strength?

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Aneata

Aquarium Advice Regular
Joined
Apr 14, 2013
Messages
55
Location
Calgary AB Canada
I’m setting up a new 20 gallon long reef and I’m trying to use some of my old supplies. I have a couple power heads but no idea how many GPH they push or what size they are. I know they are Hydor but that’s it.

Any suggestions how to figure this out? [eIMG_0037.jpgmoji848]
 
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