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- Oct 24, 2017
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I am looking to buy my first powerhead for my 20 gallon tank, I was looking at he koralia nano powerheads and was wondering which gph (240,425,565). I used my friends powerhead and It stirred up the whole aquarium and sand moved alot but I still want to have the wave effect so which gph will be strong enough to make a wave but not stir up the sand in my 20g?