I have been very happy with the 6 that I have and for the price they are well worth it .
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That’s from a different model with a different controller.
Hard to beat a gyres flow! If you do go with one have spares to swap out/in while cleaning. They require frequent cleaning to keep flow consistent.I'm thinking of getting the 166-25w for my 40 breeder. Right now I'm running two HG042 power heads, but would prefer a gyre. Thoughts?
Trying to figure out which size I need is a PITAHard to beat a gyres flow! If you do go with one have spares to swap out/in while cleaning. They require frequent cleaning to keep flow consistent.

Tank size and flow rate. Size those numbers to one. Then go one size bigger! Can always run it at lower speeds.Trying to figure out which size I need is a PITA![]()