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I use one that I believe is about 8 watts, runs 500gph (made for pondas). I've never had ANY problems with them, and have only heard good things from others.

From what I hear they are basically insurance on your fish's health.
 

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Discussion Starter · #3 ·
If u have a 8 watt and you are running 500 gallons per hour, i believe it really isnt doing anything. The flow rate is supposed to be slow to kill bacteria and even slower to kill parasites. The 9 watt that im gonna get says suggested flow at 100-200 gallons per hour and the lower the wattage the slower the flow rate. So you might want to check that out.

*Im not 100% positive but Im pretty sure this is true.
 
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