Powerhead size

Hope2158

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Is a hydor koralia 425 good enough for a 29 gallon tank or would l need to have 2?
I will have zoa's and a rock by its self with a GSP
 

Jesterrace

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It would be okay, but honestly I would strongly recommend bumping up to the Hydor Koralia 3rd Gen powerheads as they are of a better build quality. They also have a strong magnetic backing which keeps them firmly in place and multiple heads to adjust the flow. I have been running these for nearly 3 years now with no issues despite minimal maintenance.

 

Jesterrace

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Incidentally I did a review of them here (mine are the 1950gph models):

 

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